Article
Materials Science, Multidisciplinary
Xinyu Yang, Richard A. Barrett, Noel M. Harrison, Sean B. Leen
Summary: A physically-based, mixed-phase structure-property model is developed for analyzing the microstructure-sensitivity of tensile stress-strain response in additively manufactured Ti-6Al-4V, considering the effects of solutes, grain size, phase volume fraction, and dislocation density. The model incorporates solid-state phase transformation and dislocation density evolution to simulate the effects of martensite dissolution and a -b transformation at high temperature, allowing for rapid process-structure-property prediction and optimization.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Yujian Wang, Junjie Li, Jianwei Li, Lei Zhang, Jiankai Ma, Zhijun Wang, Feng He, Jincheng Wang
Summary: Coarsening of the basketweave alpha + beta microstructure in Ti-6Al-4V during thermal cycling is driven by multiple dissolution and precipitation transformations instead of conventional Ostwald ripening. This study reveals that the vanishing of alpha plates continues during repeated thermal cycling through two mechanisms, which are related to the Gibbs-Thomson effect. The influence of cycling frequency and total duration on the coarsening transformation is also detected. Long cycling duration leads to severe coarsening, while the final coarsening of alpha plates is almost independent of the cycling frequency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Matteo Villa, Jeffery W. Brooks, Richard Turner, Frederic Boitout, Robin Mark Ward
Summary: This study examined the microstructure evolution of Ti-6Al-4V titanium alloy during high energy density welding process through numerical simulations and experimental validations. The numerical predictions were shown to reasonably match with experimental results, validating various metallurgical features of the alloy.
Article
Nanoscience & Nanotechnology
Baicheng Wang, Dmytro Savvakin, Orest Ivasishin
Summary: In this study, a fine-grained and nearly dense Ti-6Al-4V alloy was successfully produced using press-and-sinter blended elemental powder metallurgy method. The developed methods, including thermocycling and hydrogenation-dehydrogenation, allowed for desirable alloy microstructure at a relatively low sintering temperature. The resulting alloy exhibited fine grain size, acceptable oxygen content, reduced residual porosity, and suitable tensile characteristics for practical application.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Weizhao Sun, Feihu Shan, Nanfu Zong, Hongbiao Dong, Tao Jing
Summary: This research investigates the phase transformation of Ti-6Al-4V during wire laser additive manufacturing using a density-based constituent phase simulation method. By increasing temperature and decreasing cooling rate, the undesirable alpha' phase can be narrowed or even eliminated. Additionally, the laser power of 3000 W results in more transformed alpha(B) without increasing alpha-lath thickness compared to the 2500 W case. The simulation shows promising prospects in predicting phase transformation and optimizing processing parameters.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Dingcong Cui, Yashan Zhang, Feng He, Jiankai Ma, Kaiwei Zhang, Zhongsheng Yang, Junjie Li, Zhijun Wang, Ji-jung Kai, Jincheng Wang, Feng Jun
Summary: Preheating is an effective method to customize the heterogeneous microstructure in the bonding zone of HMed Ti-6Al-4V by influencing the cooling rate and pseudo-isothermal annealing temperature.
MATERIALS RESEARCH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Lai Wei, Xiaofeng Xu, Yang Zhao, Yachong Zhou, Xudong Yan, Zhicheng Wu, Yongqiang Yu, Chao Wu
Summary: In this study, a shortened process combining electropulsing treatment and conventional heat treatment has been applied to develop a tri-modal microstructure in Ti-6Al-4V alloy. The tri-modal microstructure has good overall mechanical properties. It was found that electropulsing treatment contributes to the formation of low aspect ratio martensite, while the conventional heat treatment retains this morphology in the alpha grains, which can be easily spheroidized.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
J. R. Kennedy, A. E. Davis, A. E. Caballero, M. White, J. Fellowes, E. J. Pickering, P. B. Prangnell
Summary: The nature of chemical mixing and microstructure gradients across interface transitions in manufacturing tailored components with two high-performance dissimilar titanium alloys using the wire-arc additive manufacturing process has been explored. The study found that a relatively long-range chemical gradient occurs during the transition between layers produced with the two different titanium alloys, leading to a stepwise exponential decay composition profile. The alloy-alloy composition gradients had little effect on the grain structure but strongly influenced the transformation microstructure.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Jinlong Su, Fulin Jiang, Junjie Li, Chaolin Tan, Zili Xu, Haiming Xie, Jin Liu, Jie Tang, Dingfa Fu, Hui Zhang, Jie Teng
Summary: Understanding the phase transformation behaviors and microstructural evolutions during post-heat treatments is crucial for improving the mechanical performances of additively manufactured titanium alloys. This study investigates the effects of distinctive dual-stage heat treatments on the Ti-6Al-4V alloy and demonstrates that the combination of dual-stage heat treatments and salt bath quenching is an effective approach for obtaining fine microstructures and optimized strength and ductility. The study also discusses the influence of phase transformation behaviors and dislocation types on the microstructure and strengthening of the alloy.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. Donoghue, J. R. Kennedy, N. Byres, P. B. Prangnell
Summary: In-situ cooling experiments were conducted on Ti64 samples for the first time, revealing the development of alpha colonies. Primary alpha laths play a crucial role in influencing subsequent colony growth and transformation process by nucleating secondary alpha laths through sympathetic autocatalysis.
Article
Green & Sustainable Science & Technology
L. Deconinck, T. Depover, K. Verbeken
Summary: The present study experimentally investigates the uptake of hydrogen and the formation of hydrides in duplex Ti-6Al-4V. Hydrogen is introduced through electrochemical charging at room temperature. The effects of charging duration and current density are evaluated, revealing lattice strains and the formation of titanium hydrides under severe charging conditions. The charging conditions significantly influence the hydrogen distribution and hydride formation in the material. Controlling the electrochemical hydrogen charging conditions provides a better understanding of hydrogen-induced failure mechanisms and offers opportunities for sustainable thermohydrogen processing of titanium.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Engineering, Industrial
Fengying Zhang, Kun Wang, Yao Li, Yongnan Chen, Meng Yang, Meng Wang, Adam T. Clare
Summary: Research on laser directed energy deposition (DED) of Ti-6Al-4V alloy focuses on microstructure and performance optimization through alloy composition adjustments and heat treatment. Tensile properties of Ti-5.6Al-3.8V and Ti-5.3Al-3.6V alloys were found to surpass forging standards of Ti-6Al-4V, while Ti-5.0Al-3.4V exhibited lower strength due to coarsened alpha laths. Heat treatment improved elongation of Ti-5.3Al-3.6V without significant loss in tensile strength, providing guidance for producing high ductility products near Ti-6Al-4V alloy.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Xiaofeng Xu, Xudong Yan, Yu Qian, Xueying Chong, Yachong Zhou, Yuguang Zhao, Xuehui Yang, Gaofeng Liu, Chao Wu
Summary: In this study, a high-strength and properly ductile Ti-6Al-4V alloy was successfully prepared using an innovative strategy based on electropulsing. The unique microstructure evolution resulting from electropulsing led to efficient alpha' lath refinement, which greatly enhanced the strength of the alloy. This novel bi-lamellar microstructure also contributed to the proper ductility of the alloy. These results and analysis offer a new approach to improving and controlling the mechanical properties of Titanium alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
T. Chen, H. Z. Lu, W. S. Cai, L. H. Liu, Z. Wang, C. Yang
Summary: We discovered a new hierarchical microstructure in ultrastrong Ti-6Al-4V composite with TiC reinforcement fabricated via pressureless sintering. The hierarchical microstructure consists of primary thick β-Ti laths surrounding coarse equiaxed α-Ti zones, which consist of cellular structures with ultrafine equiaxed α-Ti matrix and nano/ultrafine β-Ti lamellar. The hierarchical structure originates from the inhibiting effect of nano TiC particles on β-Ti grain growth and their role as nucleation sites for α-Ti grains. The hierarchical composite exhibits ultrahigh tensile yield strength, surpassing Ti-6Al-4V alloy and its sintered composites.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
L. M. Kang, Y. J. Cai, X. C. Luo, Z. J. Li, X. B. Liu, Z. Wang, Y. Y. Li, C. Yang
Summary: The study introduces a new methodology for preparing high-performance metallic alloys, and successfully demonstrates the exceptional mechanical properties of the Ti-6Al-4V alloy.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Yingchao Li, Junsong Zhang, Martin Saunders, Yang Ren, Hong Yang, Yinong Liu
Summary: By utilizing the principles of lattice strain matching and collective atomic load transfer, ultralarge elastic strains were induced in a brittle NiTi-Nb3Sn eutectic composite, where Nb3Sn lamellae achieved a remarkable elastic lattice strain of -2.4%. This study both tests the applicability of lattice strain matching in brittle materials and explores a novel fabrication approach for in-situ composites via eutectic solidification.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Environmental Sciences
Tingting Kang, Han Wang, Zhangyuan He, Zhengying Liu, Yang Ren, Pengjun Zhao
Summary: This paper explores the impact of land use change on energy-related CO2 emissions using multi-dimension metrics. The results indicate that the scale of land use types has a bidirectional effect on emissions; land use mixture in mature city agglomerations has a significant suppressive effect; land use intensity is associated with emissions in most cities, with adverse effects spreading from west to northeast. Therefore, it is suggested to regulate land transaction, promote mixed land use, and utilize renewable energy to reduce energy footprints and mitigate emissions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Yadong Liu, Yikang Yu, Fan Yang, Guangqi Zhu, Kang Yu, Ronghui Kou, Chengjun Sun, Yuzi Liu, Jiayi Xu, Cong Liu, Chenzhao Li, Tianwei Liu, Yang Ren, Wenquan Lu, Rafael Ferreira, Paulo Ferreira, Zhengcheng Zhang, Jian Xie
Summary: A sustainable FeOF nanocomposite with extraordinary performance has been developed in this study. Compared to the current mono-valence intercalation LiCoO2, it exhibits a specific capacity and energy of 621 mAh g(-1) and 1124 Wh kg(-1), respectively, which is three times the specific capacity and double the specific energy. The (de)lithiation process is made reversible by combining nanostructured FeOF with graphene, providing interparticle electric conduction. This breakthrough represents a significant progress in developing sustainable conversion materials, eventually overcoming the driving range and cost barriers.
Article
Materials Science, Multidisciplinary
Taotao Wang, Xiangxiang Rao, Qiang Zhang, Daqiang Jiang, Yang Ren, Lishan Cui, Kaiyuan Yu
Summary: The temperature dependence of the critical stress of the R -> B19' transformation in NiTi shape memory alloys has been found to be negative in this study, in contrast to previous reports. This discovery calls for a reevaluation of this transformation.
MATERIALS RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Huajie Luo, Hui Liu, Houbing Huang, Yu Song, Matthew G. Tucker, Zheng Sun, Yonghao Yao, Baitao Gao, Yang Ren, Mingxue Tang, He Qi, Shiqing Deng, Shujun Zhang, Jun Chen
Summary: We propose an innovative strategy based on defect chemistry to achieve a giant strain of 1.12% in lead-free Bi0.5Na0.5TiO3 (BNT)-based ceramics by forming a defect-engineered morphotropic phase boundary. The incorporation of the hypothetical perovskite BaAlO2.5 with oxygen defect into BNT leads to strongly polarized directional defect dipoles, resulting in a strong pinning effect after aging. The large asymmetrical strain is mainly attributed to the aligned defect dipoles along the crystallographic [001] direction destroying the long-range ordering of the ferroelectric and promoting reversible phase transition and polarization rotation.
Article
Materials Science, Multidisciplinary
Jiacheng Ge, Peng Luo, Zhenduo Wu, Wentao Zhang, Sinan Liu, Si Lan, Jonathan D. Almer, Yang Ren, Xun-Li Wang, Weihua Wang
Summary: Studying the flow behavior of amorphous solids is crucial for understanding their deformation mechanism, but detecting basic flow events in these materials is challenging. Using simultaneous SAXS/WAXS experiments, researchers have identified elementary flow carriers in wound metallic glasses, with a radius of gyration ranging from 2.5 to 3.5 nm, based on flow-induced structural heterogeneities. The size of these carriers increases and their morphology changes from spherical to rod-like during flow. Additionally, the atomic structure undergoes an unusual change to a more disordered state during winding/annealing at a temperature around 0.8 Tg. This work provides an atomic-to-nanoscale description of flow carriers in amorphous solids during deformation.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoxu Guo, Yang Ren, Yongmei M. Jin, Yu U. Wang
Summary: A quasi-spin Ising model is used to simulate thermoeleastic martensitic transformation at the atomic scale. The model characterizes the orientation variants of the martensite phase and their interactions through long-range elastic interactions. The study focuses on the behavior of a defect-free crystal undergoing cubic-to-tetragonal martensitic transformation. The simulation shows that the diffuse scattering in the pre-martensitic austenite state is a result of the spatial correlation of atomic-scale heterogeneous lattice displacements and exhibits displacement short-range ordering. The effects of temperature, elastic anisotropy, and shear modulus softening on diffuse scattering and displacement short-range ordering are investigated.
SHAPE MEMORY AND SUPERELASTICITY
(2023)
Article
Chemistry, Physical
Jincan Ren, Yu Tang, Weibao Li, Dong He, He Zhu, Xingyu Wang, Si Lan, Zijia Yin, Tingting Yang, Zhaowen Bai, Yang Ren, Xiangheng Xiao, Qi Liu
Summary: A synergetic strategy of La, Mg co-doping and LiAlO2@Al2O3 surface coating is designed to enhance the performance of LiCoO2 (CM-LCO) cathode material under extreme temperatures. CM-LCO exhibits excellent temperature adaptability and remarkable electrochemical performance, as well as excellent cycle stability and high-rate performance. The synergistic effects of this co-modification strategy are demonstrated by investigating the electrochemical reaction kinetics and structure evolution of CM-LCO, providing a promising strategy for the application of high-voltage LCO in a wide temperature range.
Article
Chemistry, Multidisciplinary
Jiantao Li, Guangwu Hu, Ruohan Yu, Xiaobin Liao, Kangning Zhao, Tianyi Li, Jiexin Zhu, Qiang Chen, Dong Su, Yang Ren, Khalil Amine, Liqiang Mai, Liang Zhou, Jun Lu
Summary: The integration of Si into TiO2 enhances charge transfer and increases lithium-ion storage capacity.
Article
Materials Science, Multidisciplinary
Huajie Luo, Shiyu Tang, Zheng Sun, Yueyun Zhang, Yonghao Yao, Huashan Zheng, Jikun Yang, Yang Ren, Mingxue Tang, Houbing Huang, Hui Liu, Manuel Hinterstein, Jun Chen
Summary: In order to improve the thermal stability of Bi0.5Na0.5TiO3-based piezoelectrics, the researchers introduced Ag into BNT-6BT, forming BNT-6BT/100xAg composite ceramics. Experimental results show that when x=0.06, the depolarization temperature (Td) of the composite ceramics is improved to 145 degrees Celsius without compromising the piezoelectric response. This improvement is attributed to the synergistic effect of residual thermal stress, colossal grain size (above 200 μm), and oxygen vacancies. The study provides an effective method to enhance the thermal stability of BNT-based ceramics and can be applied to other systems as well.
Article
Materials Science, Multidisciplinary
Tangqing Cao, Qian Zhang, Liang Wang, Lu Wang, Yao Xiao, Jiahao Yao, Huaiyi Liu, Yang Ren, Jun Liang, Yunfei Xue, Xiaoyan Li
Summary: High-entropy alloys (HEAs) possess unique microstructures and chemical compositions, resulting in remarkable mechanical properties. In this study, the mechanical behaviors and deformation mechanisms of CoCrFeNi HEAs under dynamic loading were investigated through experiments and simulations. The results showed significant strain rate sensitivity and strain-hardening capability of CoCrFeNi HEAs at high strain rates. The findings shed light on the design and fabrication of HEAs with excellent dynamic mechanical properties.
Article
Engineering, Multidisciplinary
Xiangguang Kong, Ying Yang, Yang Ren, Lishan Cui, Shijie Hao
Summary: This study examined the deformation behavior in Nb nanoparticle-martensitic NiTi composite wire under tensile loading using in-situ high-energy X-ray diffraction. The presence of dispersed Nb nanoparticles had minimal impact on the transformation and deformation behavior of the NiTi matrix, resulting in the absence of R phase transformation and the occurrence of deformation twinning in the NiTi matrix. Deformation twinning in the NiTi matrix reduced the shape strain caused by unfavorable orientated martensite variants and decreased the internal stress among NiTi martensite variants during the martensite reorientation process. Additionally, TEM results confirmed that Nb nanoparticles achieved a large elastic strain in the B19' -NiTi matrix (-4%), similar to Nb nanowires, but this strain was released with the occurrence of NiTi deformation twinning.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Fan Xue, Qiang Li, Mingxin Lv, Yuanfei Song, Tianxing Yang, Xiaoge Wang, Tianyi Li, Yang Ren, Koji Ohara, Yufei He, Dianqing Li, Qiheng Li, Xin Chen, Kun Lin, Xianran Xing
Summary: This study reports the local structure of Pd nanocatalysts, revealing the atomic surface distribution of unique compressed strain in Pd nanocatalysts. The surface strain, induced by the shape of the catalyst, significantly weakens the adsorption energy of ethylene and avoids the over-hydrogenation of acetylene, leading to higher selectivity for ethylene.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jian Hui, Qingyun Hu, Hongjian Yuan, Ruiqian Shi, Xiang Huang, Yuanyuan Wu, Yang Ren, Zhan Zhang, Hong Wang
Summary: By using high-throughput experiments, the optical properties and structural evolution of Ge-Sb-Te alloy films were studied, and it was found that the modulation period and chemical composition have a significant impact on amorphous stability and optical properties.
Article
Materials Science, Multidisciplinary
Jiacheng Ge, Yao Gu, Zhongzheng Yao, Sinan Liu, Huiqiang Ying, Chenyu Lu, Zhenduo Wu, Yang Ren, Jun-ichi Suzuki, Zhenhua Xie, Yubin Ke, Jianrong Zeng, He Zhu, Song Tang, Xun-Li Wang, Si Lan
Summary: Fe-based metallic glasses are promising materials in the fields of advanced magnetism and sensors. This study proposes a novel approach to tailor the amorphous structure through liquid-liquid phase transition, and provides insights into the correlation between structural disorder and magnetic order. The results show that the liquid-liquid phase transition can induce more locally ordered nanodomains, leading to stronger exchange interactions and increased saturation magnetization. The increased local heterogeneity also enhances magnetic anisotropy, resulting in a better stress-impedance effect.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
