Article
Metallurgy & Metallurgical Engineering
Wang Furong, Zhang Yongmei, Bai Guoning, Guo Qingwei, Zhao Yuhong
Summary: Mg-Sn alloy is a potential lightweight automobile material with high temperature-creep resistance. Adding Sn to Mg reduces overall cost, and the formation of Mg2Sn phase improves precipitation hardening. Al-doping significantly enhances the age hardening effect of Mg-Sn alloy due to segregation at the Mg matrix and Mg2Sn phase interface. This study investigates different orientations of Al-doped Mg and Mg2Sn phase to determine stable doping positions through calculations and analyzes the effects of Al doping on the electronic structure of the Mg/Mg2Sn interface. The results indicate that certain Al-doping positions strengthen the stability of the interface, and Al-Sn bonding dominates at the interface.
ACTA METALLURGICA SINICA
(2023)
Article
Materials Science, Multidisciplinary
Yingying Chen, Enci Zuo, Xilong Dou, Li Chen, Aijie Mao, Gang Jiang
Summary: The dynamical, mechanical, anisotropic, and thermodynamic properties of Mg-XL-Y (XL = Zn, Al) alloys based on three long-period stacking ordered (LPSO) phases (ie, 10H, 14H, and 18R) have been systematically investigated by first-principles calculations. The LPSO phases of Mg-XL-Y (XL = Zn, Al) alloys are stable in terms of thermodynamics, dynamics, and mechanics. The Mg-Al-Y alloys exhibit superior mechanical properties compared to Mg-Zn-Y alloys, with larger resistances to deformation, stiffness, and hardness.
Article
Chemistry, Physical
Xin Yu, Yang Bai, Bing Ye, Liyang Wang, Beibei Zhao, Xiangyang Kong
Summary: The thermal stability and grain growth kinetics of a high-pressure die casting Mg-6Y-3Zn-1Al alloy with long-period stacking ordered phase were studied through subsequent annealing at different temperatures. The results showed that the microstructure of the alloy was thermally stable up to 450 degrees C. The grain growth kinetics between 450 degrees C and 550 degrees C followed a kinetic equation, and the grain growth exponent varied with temperature. The activation energy values indicated that bulk diffusion was the main grain growth mechanism. The alloy exhibited excellent thermal stability below 500 degrees C and the microstructure evolution was influenced by the dissolution of the long-period stacking ordered phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jiawei Yuan, Ting Li, Kui Zhang, Xinggang Li, Yongjun Li, Minglong Ma, Guoliang Shi, Zhiwei Du, Wei Liu, Yonggang Peng
Summary: In an Mg-7Gd-3Y-2Zn-0.5Zr alloy aged isothermally at 240 degrees C, two types of precipitation sequences involving Mg-Gd and long period stacking ordered (LPSO) were identified. Nd was found to significantly affect the priority precipitation of Mg-Gd and LPSO sequences during aging. The morphology, distribution, and crystal structure of the precipitates formed during isothermal aging were investigated.
Article
Nanoscience & Nanotechnology
Xiaojie Zhou, Wenying Xiong, Gang Zeng, Hongchao Xiao, Jian Zhang, Xianzheng Lu, Xiaomin Chen
Summary: The combined effects of LPSO orientation and alpha-Mg texture on tensile anisotropy were investigated, with the extrusion direction showing optimal mechanical properties, the 45 degrees direction exhibiting high elongation, and the transverse direction having inferior strength and elongation simultaneously. LPSO orientation contributes to strength anisotropy through different load-bearing strengthening effects along different tensile axes, while alpha-Mg texture contributes to strength anisotropy through stronger grain boundary strengthening effects. However, LPSO orientation, rather than alpha-Mg texture, accounts for ductility anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Mingyu Li, Guangzong Zhang, Siqi Yin, Changfeng Wang, Renguo Guan
Summary: This paper calculates and analyzes the electronic and optical properties of the long-period stacking order (LPSO) phase in Mg-Y-Zn alloy using first principles. The results show that the LPSO phases have metallic characteristics and no energy gap. The 14 H phase is thermodynamically more stable than the 18 R phase due to stronger covalent bonds. Both phases exhibit high absorption coefficients within the energy range of 0-19 eV, with the strongest absorption peaks occurring at photon energies of 4.48 eV and 4.8 eV for the 14 H and 18 R phases, respectively. The photon absorption rate is inversely proportional to the density of L12 clusters in both phases.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Hidetoshi Somekawa, Michiaki Yamasaki, Yoshihito Kawamura, Tadanobu Inoue
Summary: By changing the insertion direction of the rolled billet, it is possible to control the area fraction of deformation kink bands, which can impact the mechanical properties of the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Changwei Wang, Kangning Han, Xin Liu, Yaxin Zhu, Shuang Liang, Lv Zhao, Minsheng Huang, Zhenhuan Li
Summary: The hydrogen-vacancy interactions in CoCrFeMnNi high-entropy alloy were studied using first-principles calculations. The results show that solute hydrogen atoms reduce the vacancy formation energy but hinder the formation of vacancy clusters. This provides an explanation for the good resistance to hydrogen embrittlement observed in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Shuai Yuan, Jinhui Wang, Lei Zhang, Peipeng Jin
Summary: This study investigated the hot deformation behavior of a heat-treated Mg-12Y-1Al alloy containing long-period stacking ordered (LPSO) phase through uniaxial compression experiments. The flow stress decreased with increasing temperature and decreasing strain rate. Dynamic recrystallization (DRX) was promoted by higher temperatures. The main DRX mechanism observed was discontinuous dynamic recrystallization (DDRX), while the dense lamellar LPSO at the grain boundary hindered DDRX. The deformed microstructure showed a typical [0001]//CD texture, and its intensity decreased with increasing temperature due to multiple slip systems activation and increased DRX fraction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Z. Z. Peng, X. H. Shao, Z. M. Liang, D. L. Wang, L. W. Wang, X. L. Ma
Summary: To optimize the mechanical properties of LPSO-containing Mg alloys, a Mg-Zn-Y-Zr alloy with intragranular and free grain boundary LPSO phases was successfully prepared by homogenization. The strengthening and toughening mechanisms were unraveled through transmission electron microscopy characterization and theoretical analysis, revealing the synergistic deformation mechanism of multiple kinking and twinning in the grains. The activation of kinking and twinning depended on the thicknesses of LPSO lamellae and their relative spacing, providing insights for optimizing the design of Mg alloys regulating the microstructure of LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Janet M. Meier, Jiashi Miao, Song-Mao Liang, Jun Zhu, Chuan Zhang, Josh Caris, Alan A. Luo
Summary: This study conducted key experiments and CALPHAD calculations to provide critical understanding of high-strength Mg-Gd-Y-Zn alloys. The experimental results were used to validate and improve the thermodynamic database of this alloy system, and accurately predict the development of promising high-strength Mg-Gd-Y-Zn alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Shuai Yuan, Jinhui Wang, Lei Zhang, Shiyu Luan, Peipeng Jin
Summary: The presence of long-period stacking ordered (LPSO) phase can inhibit the activation and growth of twins in the alloy, as well as obstruct the movement of non-basal slip, resulting in improved mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yuto Nakasuji, Hidetoshi Somekawa, Motohiro Yuasa, Hiroyuki Miyamoto, Michiaki Yamasaki, Yoshihito Kawamura
Summary: This study quantified the kink-band strengthening effect in a Mg-9%Y-6%Zn alloy through uniaxial hot compression. The increase in hardness due to kink-band strengthening was found to be closely related to the number of kink boundaries beneath the indentation. The estimated kink-band strengthening values from microscopic analysis were similar to those obtained from prior macroscopic analysis.
Article
Materials Science, Multidisciplinary
Z. Aalipour, A. Zarei-Hanzaki, A. Moshiri, H. R. Abedi, Daudi Waryoba, A. Kisko, L. P. Karjalainen
Summary: The microstructure and microtexture changes of an extruded and annealed magnesium alloy were investigated under different strain and processing conditions. The results showed that the material underwent noticeable refinement even at low applied compressive strain. Recrystallization process was completed at a true strain of 0.3, and grain refinement was attributed to the LSN and CDRX mechanisms. At higher strain levels, most grains were found in deformed states and the microtexture only changed in terms of intensity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Zhiyu Chang, Qingchen Deng, Qiao Lan, Jian Feng, Daquan Li, Baoliang Liu, Yujuan Wu, Liming Peng, Wenjiang Ding
Summary: This study characterized and analyzed the microstructure and mechanical properties of Mg alloy castings prepared by rheo-diecasting and compared them with conventional diecasting. The solution-treated rheo-diecast alloy showed a significant improvement in elongation but a decrease in room-temperature tensile mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Masatake Yamaguchi, Mitsuhiro Itakura, Tomohito Tsuru, Ken-ichi Ebihara
Summary: First-principles calculations were used to evaluate the trapping energy of a hydrogen atom in screw and edge dislocations in aluminum. The maximum trapping energies were found to be higher after the zero-point vibrational energy correction. The calculation conditions excluded hydrogen-hydrogen interactions.
MATERIALS TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Daisuke Egusa, Koji Inoue, Yasuyoshi Nagai, Eiji Abe
Summary: The study found that kink boundaries (KBs) undergo reconstruction during post-annealing, forming local hexagonal close-packed Mg regions and enhancing thermal stability. The reconstruction of dislocation structures plays an important role in solute-enriched face-centered cubic layers within LPSO structures.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Tomohito Tsuru, Mitsuhiro Itakura, Masatake Yamaguchi, Chihiro Watanabe, Hiromi Miura
Summary: By using density functional theory calculations, this study investigated the effect of Al and V solutes on dislocation motion in pure titanium and alpha-titanium alloys. It was found that both Al and V solutes reduce stacking fault energy in the basal plane, while Al solute increases stacking fault energy in the prismatic plane. These solutes facilitate dislocation motion in the basal plane by reducing the energy difference between prismatic and basal cores.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Kai Guan, Mariko Egami, Daisuke Egusa, Hajime Kimizuka, Michiaki Yamasaki, Yoshihito Kawamura, Eiji Abe
Summary: In this study, SRO solute clusters in the I-1 type LPSO phases in Mg-CoY alloys have been investigated using atomic-resolution STEM and first-principles calculations. The Co3Y5 SRO cluster model embedded across the I-1-type SFs has been successfully constructed to enhance the energetic stability of the LPSO phases. The findings reveal the crucial role of solute SRO clusters in the formation and stability of LPSO phases in ternary Mg alloys.
SCRIPTA MATERIALIA
(2022)
Article
Metallurgy & Metallurgical Engineering
Kai Guan, Daisuke Egusa, Eiji Abe
Summary: The microstructures of an as-cast Mg97.49Ho1.99Cu0.43Zr0.09 alloy were investigated using atomic resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The study revealed the presence of ordered long period stacking/order (LPSO) phases and short-range order (SRO) clusters embedded in stacking fault layers. The results support the importance of L1(2)-type TM6RE8 clusters in the formation of LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Kai Guan, Daisuke Egusa, Eiji Abe, Jinghuai Zhang, Xin Qiu, Qiang Yang, Jian Meng
Summary: The effect of Gd content on the microstructure and tensile properties of as-cast Mg-Sm-Zn-Zr alloy was investigated. The addition of Gd inhibited the segregation behavior of Zn in the Mg3Sm phase and improved the tensile yield stress of the alloy. Gd-modified alloys exhibited significant age-hardening effect, attributed to the high-volume fraction and high density nano-scale precipitates.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Nuclear Science & Technology
Shintaro Hirayama, Koichi Sato, Daiji Kato, Hirotomo Iwakiri, Masatake Yamaguchi, Yoshiyuki Watanabe, Takashi Nozawa
Summary: The study showed that the binding energy between hydrogen and vacancies or vacancy-carbon complexes in alpha-Fe changes under uniaxial tensile strain, leading to an increase in hydrogen retention with increasing strain, with vacancies playing a more significant role in affecting hydrogen retention.
NUCLEAR MATERIALS AND ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Daisuke Egusa, Ryo Manabe, Takuro Kawasaki, Stefanus Harjo, Shigeo Sato, Eiji Abe
Summary: Based on X-ray diffraction analysis, this study attempts to quantify the volume fraction of solute-enriched stacking faults (SESFs) in Mg-Zn-Gd alloys with a hexagonal-close-packed structure. It is found that SESFs with a local face-center-cubic stacking mainly exist with a limited thickness, causing anisotropic broadening of the diffraction peaks, including the c*-component. By treating SESFs as intergrowth-like precipitates, the asymmetric peak profile can be successfully decomposed into the hcp-matrix and SESF peaks, allowing for a highly quantitative estimation of the relevant volume fractions.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Masatake Yamaguchi, Tomohito Tsuru, Mitsuhiro Itakura, Eiji Abe
Summary: This study reveals that atomistic penetration precedes surface-adsorption-assisted bond-breaking and controls the specificity of liquid metal embrittlement (LME).
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Kakeru Ninomiya, Koki Itamoto, Hiroyuki Setoyama, Daisuke Egusa, Eiji Abe, Michiaki Yamasaki, Maiko Nishibori
Summary: This study investigated the formation of L12 clusters and the interactions between transition metal (TM) and rare-earth (RE) atoms in magnesium-based alloys. X-ray absorption spectroscopy (XAS) and ab initio calculations were used to analyze the alloy before and after aging. The results showed that rare-earth elements play a crucial role in the formation of L12 clusters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Koji Kimura, Daisuke Egusa, Koji Hagihara, Nohisa Happo, Naomi Kawamura, Hiroo Tajiri, Kouichi Hayashi, Eiji Abe
Summary: X-ray fluorescence holography was used to study the dilute Mg99.2Zn0.2Y0.6 alloy annealed at 520 celcius for 5 h and obtain atomic images around Zn atom. Clear hologram patterns were obtained despite the low concentration of solute-element. The reconstructed atomic images revealed that Zn atoms mainly occupy the hcp Mg site in this annealed alloy, consistent with the transmission electron microscope image.
MATERIALS TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.