Article
Materials Science, Multidisciplinary
Qi Zhao, Zhiyi Liu
Summary: To obtain a strong Goss texture in Al-Cu-Mg alloy sheet, texture evolution and related mechanisms during solution treatment were studied. It was found that the Goss texture can further develop during solution treatment, which is attributed to the growth of recrystallized Goss grains into deformed Brass grains and the slow growth of recrystallized Goss grains into substructured random grains. The effect of particles stimulated nucleation (PSN) on Goss texture formation and development was also revealed, showing that large Fe-rich phases restrict Goss grain nucleation and growth while relatively small θ and S phases do not hinder the development of Goss texture.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Rensong Huang, Hongfu Yang, Shanju Zheng, Mengnie Li, Hui Wang, Yonghua Duan, Chongfeng Yue, Chun Yang
Summary: The evolution mechanism of the second phase in the homogenization process of Al-Zn-Mg-Cu aluminum alloy was thoroughly investigated. The results revealed that the phase transition of Mg(Zn, Cu, Al)2 to S(Al2CuMg) occurs due to the interdiffusion between Zn and Al atoms at the interface during homogenization at 420 degrees C for 15 to 30 min. Additionally, the dissolution of S(Al2CuMg) into the Al-matrix is governed by the interdiffusion of (Mg, Cu atoms) and Al atoms. Notably, the 0(Al2Cu) phase plays a crucial role as an intermediate transition phase facilitating the dissolution of S(Al2CuMg) into the Al-matrix.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Xia Zhao, Min Wang, Xian-Chao Hao, Xiang-dong Zha, Ming Gao, Ying-Che Ma, Kui Liu
Summary: M23C6 carbides with a dendritic morphology were discovered for the first time in continuously cooled Alloy 690, mainly due to interfacial destabilization. The size of carbides, relative supersaturation, and constitutional undercooling are key factors influencing the formation of dendritic morphology. Additionally, the formation of dendritic morphology is sensitive to cooling rate and cannot occur at a rate lower than 2 degrees C/min.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Souriddha Sanyal, Pallabi Bhuyan, Tapas K. Bandyopadhyay Sumantra Mandal
Summary: In this study, the effects of different thermomechanical processing on a Mg alloy were investigated. It was found that hot rolling resulted in a uniform grain size distribution, improved ductility, and work hardening response. In contrast, hard plate hot forging led to a bimodal grain size distribution and a stronger basal fiber texture.
Article
Materials Science, Multidisciplinary
Congchang Xu, Hong He, Zhigang Xue, Luoxing Li
Summary: In this study, the grain refinement capability of the commercially used AA7005 aluminum alloy through hot deformation was investigated. Different types of grain structure evolution were observed, with DRX being highly dependent on the parameters. DRX was more favorable at high temperatures, low strain rates, and large strains, resulting in fine grains through various mechanisms. By controlling the deformation parameters, the original coarse grains were successfully refined down to 8-25 μm. The results indicate the great potential of AA7005 alloy for grain refinement through hot deformation, emphasizing the importance of parameter control.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Haoyuan Ma, Weidong Zeng, Yinze Kou, Xiaobo Liang
Summary: The deformation behavior of Ti-22Al-25Nb alloys with refined initial grain size was studied, revealing significant continuous flow softening at low to moderate strain rates. Analysis of the microstructures using EBSD showed the presence of grain boundary sliding (GBS) mechanism in addition to conventional mechanisms. The study provides direct evidence of GBS in current alloys and identifies its dominant role in high-temperature deformation and softening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Xiao Liu, Jiaxuan Xu, Fan Zhao, Xinhua Liu, Yuxing Tian
Summary: In this study, AA 5052 aluminum alloy tube billets were prepared using HCCM vertical continuous casting, and the effect of homogenization temperature and time on the second phases and mechanical properties was investigated. The optimized homogenization conditions were found to significantly improve the elongation and result in the formation of fine and interlaced phases, thus improving the effectiveness of homogenization treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xinghao Li, Hongkai Lian, Zhongwu Zhang, Ye Cui
Summary: Directional recrystallization (DR) was used to obtain columnar grains in a superelastic CuAlMn alloy. The microstructural evolution of the alloy during DR and the abnormal grain growth mechanism for the formation of columnar grains were investigated. It was found that columnar grains could be obtained when the hot-zone temperature was above the alpha-phase solvus temperature of -730 degrees C. The optimum drawing velocities for obtaining columnar grains with the largest aspect ratio increased with increasing hot-zone temperatures.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
L. G. Hou, H. Yu, Y. W. Wang, L. You, Z. B. He, C. M. Wu, D. G. Eskin, L. Katgerman, L. Z. Zhuang, J. S. Zhang
Summary: The impact of a modified retrogression and re-aging (RRA) process on the properties of a high-strength AA7050 Al alloy was investigated. The study showed that increasing retrogression temperature and time led to a decrease in strength and an increase in electrical conductivity. Compared to the traditional RRA process, the modified process exhibited better suitability for treating (mid-)thick plates. However, a higher retrogression temperature resulted in more intragranular precipitates and wider precipitate free zones, leading to a strength loss.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Theophilus Wallis, Reza Darvishi Kamachali
Summary: The role of grain boundaries (GBs) in determining the properties of polycrystalline materials is influenced by their structure and chemistry. In this study, we investigate the co-evolution of GB structure and segregation in Fe-Mn alloys. We find that the coupling between the chemical and structural states of GBs amplifies Mn segregation transition, even when the GB structure remains unchanged. When the GB structure is non-uniform, low- and high-Mn phases can coexist within the GB region. These findings provide insights into the structural sensitivity of GB segregation and the chemo-structural interplay.
Article
Nanoscience & Nanotechnology
Guotong Zou, Lingying Ye, Jun Li, Zhixin Shen
Summary: The microstructure evolution and superplastic deformation mechanisms of a 2A97 Al-Cu-Li alloy with initial banded grains were studied. Uniaxial superplastic tensile tests were conducted and surface studies were carried out to investigate the deformation mechanisms. The results showed that the banded grains transformed into equiaxed grains during deformation, and the deformation process could be divided into two stages, with intragranular dislocation slip dominating in the primary stage and grain boundary sliding dominating in the secondary stage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Joze Arbeiter, Maja Voncina, Barbara Setina Baltic, Jozef Medved
Summary: The transformation of the Al6Fe metastable phase was analyzed using DSC, optical and SEM, and XRD. A low-impurity alloy was produced in a controlled environment, achieving solidification of the Al6Fe phase with a cooling rate of 35 K/s. Homogenization at 600 degrees C for 2-24 h resulted in the completion of transformation from Al6Fe to Al13Fe4.
Article
Materials Science, Multidisciplinary
He Jiang, Xuemei Xiang, Jianxin Dong
Summary: The present study investigated the impact toughness degeneration and microstructure evolution of alloy 617B during long-term aging at temperatures of 650-725 degrees Celsius for up to 12,000 hours. It was found that the impact toughness decreases significantly even after just 20 hours of aging within the temperature range, and it continues to decrease as the aging time prolongs. The degeneration of impact toughness is attributed to the combined effect of plasticity evolution and grain boundary carbide coarsening. The degeneration process can be divided into rapid decrease stage, slow decrease stage, and stable stage. Sufficient attention should be paid to the impact toughness degeneration when evaluating long-term stability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Lu Wen, Wencai Liu, Guohua Wu, Henglong Wu, Liang Zhang, Jiangwei Sun, Jinshuo Zhang, Shihao Xu, Chunchang Shi, Yongbo Wang, Yejun Lu
Summary: The addition of 0.15 wt% Cr can improve the comprehensive performance of the Al-6.5Zn-2Cu-1.5 Mg-0.05Ti alloy, reducing stress corrosion cracking susceptibility index by 82%, increasing elongation by 42%, with a slight decrease in strength.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Lijiao Yin, Zhichao Sun, Zhikun Yin, Yu Wang, Xuanshuang Li
Summary: In this paper, the formation process of precipitate-free zones (PFZs) and its relationship with beta grain boundaries and alpha phase in TC18 titanium alloy were investigated. It was found that the formation of PFZ was influenced by the misorientation of beta grain boundaries and the morphology of grain boundary alpha phase. The formation of thick and continuous alpha phase at low angle beta grain boundaries led to the depletion of stabilizing elements near the beta grain boundaries, resulting in the formation of PFZ. At high angle beta grain boundaries, both discontinuous alpha phase and grain boundary Widmanstatten alpha phase can precipitate, without obvious PFZ. Pre-deformation in the beta phase field can increase the content of high angle beta grain boundaries and promote the formation of discontinuous alpha phase, effectively reducing the area of PFZ.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
O. Esmaielzadeh, A. R. Eivani, M. Mehdizade, S. M. A. Boutorabi, S. M. Masoudpanah
Summary: The aim of this study is to develop a biodegradable magnesium-based nanocomposite with enhanced mechanical and antibacterial properties. Nano- and micro-scale zinc oxide (ZnO) and copper-zinc oxide (Cu/ZnO) reinforcements were incorporated into WE43 magnesium alloy, resulting in a composite with more uniform particle distribution and higher antibacterial activity, compressive strength, and micro hardness compared to the monolithic alloy.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
A. Baghbani Barenji, A. R. Eivani, H. Vafaeenezhad, N. Park, H. R. Jafarian
Summary: This study investigates the variations in the microstructure and mechanical properties of AA2024 aluminum alloy using the HFQ-ECAP method. The results showed that increasing the number of deformation passes improved strain uniformity and led to significant grain refinement. Furthermore, the formation of shear bands reduced in consecutive passes of deformation, and the central regions exhibited preferable properties compared to the surface area. The microhardness test indicated more uniform outcomes with an increase in the number of ECAP passes.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
A. R. Eivani, M. Mehdizade, M. Ghosh, H. R. Jafarian
Summary: The influence of multiple passes during friction stir processing (FSP) on microstructure, hardness, compressive strength, and corrosion behavior of a Mg-based bio-composite was investigated. The results showed significant grain refinement, fragmentation of secondary phase particles, and enhanced corrosion resistance with increasing FSP passes. The findings suggest that the improvements were due to the uniform distribution of nano-sized hydroxyapatite (nHA) and the redistribution of secondary phase particles.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Bahram Azad, Ali Reza Eivani, Mohammad Taghi Salehi
Summary: In this study, the effects of homogenization heat treatment and equal channel angular pressing process (ECAP) on the microstructure and mechanical properties of Zn-22Al alloy were investigated. Homogenization resulted in a transformation from a lamellar structure to equiaxed grains. Homogenization also led to the formation of a homogeneous structure and a decrease in microhardness. On the other hand, the ECAP process was effective in achieving an ultra-fine grained (UFG) and equiaxed microstructure, improving superplastic behavior and increasing failure elongation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Biomedical
N. E. Putra, M. A. Leeflang, M. Klimopoulou, J. Dong, P. Taheri, Z. Huan, L. E. Fratila-Apachitei, J. M. C. Mol, J. Chang, J. Zhou, A. . A. . Zadpoor
Summary: The development of biodegradable Fe-based bone implants has made significant progress by using 3D printing technology to fabricate porous FeMn-akermanite composite scaffolds. These scaffolds address the challenges associated with Fe-based biomaterials for bone regeneration, including low biodegradation rate, MRI-incompatibility, mechanical properties, and limited bioactivity.
ACTA BIOMATERIALIA
(2023)
Review
Engineering, Biomedical
Yageng Li, Yixuan Shi, Yuchen Lu, Xuan Li, Jie Zhou, Amir A. Zadpoor, Luning Wang
Summary: With the advancement of additive manufacturing, customized vascular stents can now be fabricated to fit the curvatures and sizes of narrowed or blocked blood vessels, reducing the risk of thrombosis and restenosis. Additive manufacturing also allows for the design and fabrication of complex stent unit cells, enabling faster design iterations and shorter development time. This review focuses on recent advances in additive manufacturing for vascular stents, including biomaterials, technologies, design criteria, limitations, and future directions.
ACTA BIOMATERIALIA
(2023)
Article
Engineering, Civil
Abhishek Ghosh, Kalyan Das, Ali Reza Eivani, Hossein Mohammadi, Hossein Vafaeenezhad, Uttam Kumar Murmu, Hamid Reza Jafarian, Manojit Ghosh
Summary: Equal channel angular pressing (ECAP) is used to refine the grain structure and improve the mechanical properties of metals and alloys. This study investigates the deformation behavior of EN AW 7075 alloy during ECAP using both experimental and simulation methods. The results show that an outer corner angle (OCA) of 20 degrees and 30 degrees leads to the highest and most uniform effective strain. The formation of ultra-fine grain structures and precipitates during the post-ECAP process contributes to the improvements in hardness, yield strength, and ultimate strength.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Chemistry, Physical
H. Vafaeenezhad, S. Aliakbari-Sani, S. H. Seyedein, M. R. Aboutalebi, A. R. Eivani
Summary: The substructure evolutions of three Sn alloys were investigated using a dislocation density constitutive equation. It was found that the addition of Cu improved the strength of Sn and the Sn-5Sb-0.5Cu alloy exhibited an enhanced work hardening rate during tensile deformation. The results of the dislocation density calculation have direct implications on the capability to model the superimposed effect of dislocation densities and subgrain boundaries on the mechanical properties of polycrystals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Amin Ghaedrahmati, Hamid Reza Jafarian, Ali Reza Eivani, Saeed Khani Moghanaki
Summary: Inconel 617 specimens were hot rolled at various temperatures and the effect on dynamic strain aging (DSA) was examined through tensile tests. The microstructural evolution was studied using different techniques and the stress-strain curves were analyzed. Changes in serrated flow and the occurrence of different types of serrations were observed with variations in strain rate and temperature. The activation energy for DSA was calculated and the diffusion of substitutional atoms was found to be the main factor. The hot rolling temperature was also found to significantly influence DSA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Biomedical
Y. Li, P. Pavanram, J. Buehring, S. Ruetten, K-U. Schroeder, J. Zhou, T. Pufe, L. N. Wang, A. A. Zadpoor, H. Jahr
Summary: This study investigates the performance of AM porous iron by comparing its biodegradation behavior and cytocompatibility under static and dynamic conditions. The research finds that the biodegradation rate of AM porous iron significantly increases under in situ-like conditions, and its compatibility with various cell types is enhanced.
ACTA BIOMATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Helda Pahlavani, Kostas Tsifoutis-Kazolis, Mauricio C. Saldivar, Prerak Mody, Jie Zhou, Mohammad J. Mirzaali, Amir A. Zadpoor
Summary: This research proposes a modular approach called Deep-DRAM that utilizes deep learning techniques to generate numerous microstructures with predefined elastic properties and dimensions for various applications in high-tech industries, such as soft robotics and biomedical engineering.
ADVANCED MATERIALS
(2023)
Article
Engineering, Biomedical
A. van Kootwijk, B. P. Jonker, E. B. Wolvius, M. Cruz Saldivar, M. A. Leeflang, J. Zhou, N. Tumer, M. J. Mirzaali, A. A. Zadpoor
Summary: This study designed patient-specific cage implants using a semi-automated workflow and evaluated their biomechanical performance. The results showed satisfactory mechanical functioning of the implants under demanding chewing conditions. The proposed workflow can assist clinical engineers in creating reconstruction systems and streamlining pre-surgical planning.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Review
Engineering, Biomedical
Niko E. Putra, Jie Zhou, Amir A. Zadpoor
Summary: The need for sustainable development is urgent due to environmental challenges. Utilizing renewable and waste materials for biomaterials and tissue engineering is a promising approach. This review discusses the transformation of waste materials like eggshells, seashells, fish residues, and agricultural biomass into biomaterials for bone tissue engineering. It also highlights the use of probiotics and renewable polymers to improve bone implants, as well as the potential of additive manufacturing for sustainable biomaterials production.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Maryam Mehdizade, Ali Reza Eivani, Omar Esmaielzadeh, Fatemeh Tabatabaei
Summary: Good biocompatibility, low biodegradation rate, and excellent mechanical properties are essential for metallic biomaterials. In this study, bioabsorbable WE43 Mg alloy was used to fabricate bio-composites with nanosized hydroxyapatite (HA) particles by friction stir processing (FSP). The results showed that FSP caused grain refinement of the Mg matrix and uniform dispersion of HA nanoparticles. The addition of HA reduced Mg2+ release and H2 evolution, and improved wettability and microhardness of the bio-composites. Cell culture experiments demonstrated excellent biocompatibility and cell proliferation of the bio-composites with uniform HA distribution.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Maryam Mehdizade, Ali Reza Eivani, Hamed Asgari, Yashar Naghshin, Hamid Reza Jafarian
Summary: In this study, a Mg-based biomedical composite was successfully fabricated by adding Hydroxyapatite bioactive nanoparticles into a substrate of bioabsorbable WE43 Mg alloy using multi pass friction stir processing (FSP). The study showed that increasing the number of FSP passes led to a decrease in grain size, improved homogeneity of Hydroxyapatite bioactive particles, and reduced agglomeration. In vitro Biodegradation tests demonstrated a decrease in weight loss and biodegradation rate as the number of FSP passes increased. Additionally, immersion in simulated body fluid showed that the fabricated Mg-Hydroxyapatite bio-composites exhibited bone-like apatite forming ability. The biocompatibility of the bio-composites was also evaluated and the results showed that the viability of L-929 fibroblast cells improved with an increase in the number of FSP passes. The addition of Hydroxyapatite particles and an increase in the number of FSP passes also increased the yield strength values of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
