Article
Materials Science, Multidisciplinary
Meimei Li, Xuan Zhang, Wei-Ying Chen, T. S. Byun
Summary: Additive manufacturing of 316L stainless steel shows advantages in creep behavior, such as higher stress dependence of the minimum creep rate and relatively lower creep life. The creep life of AM 316L SS can be improved through optimized manufacturing processes.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
X. He, X. K. Shang, B. B. He
Summary: This study investigates the contribution of dislocation cell to the yield strength of additively manufactured 316L steel through nanoindentation technique. It is found that the contribution of dislocation cell to yield strength significantly increases with larger indentation size.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Yan Chen, Boyuan Gou, Xin Xu, Xiangdong Ding, Jun Sun, Ekhard K. H. Salje
Summary: The study identifies multiple collapse mechanisms of complex materials produced by additive manufacturing through measurements of acoustic emission. The correlation between acoustic emission avalanches and deformation mechanisms is shown to hold in complex AM metallic materials. The multibranching phenomenon can be utilized to identify deformation mechanisms in AM alloys and enable online monitoring of deformation processes.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Rong Li, Wenge Chen, Kai Zhou, Yana Yang, Longlong Dong, Ahmed Elmarakbi, Yong-Qing Fu
Summary: Tungsten skeleton reinforced copper matrix composites (TRC) were fabricated using selective laser melting (SLM) and infiltration sintering. The deformation and fracture mechanisms were found to vary at different temperatures, including cleavage of tungsten, intergranular fracture of tungsten particles, tearing of copper, and separation between copper and tungsten.
Article
Engineering, Manufacturing
Behzad Bahrami Babamiri, Baxter Barnes, Arash Soltani-Tehrani, Nima Shamsaei, Kavan Hazeli
Summary: The study introduces a novel design optimization approach that considers scale separation and size effects to achieve a specific macroscopic mechanical response, guiding new topological designs by correlating local stress distribution within struts and underlying microstructures. By using finite element simulations to assess the interplay between topology and microstructure, a new set of topologies is designed, built, and validated with experiments, showing improvements in energy absorption capacity and flow stress compared to previous models. In summary, considering the effects of topology and microstructure on the mechanical behavior of lattice structures has the potential to substantially improve key performance metrics.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Zan Li, Yinan Cui, Wentao Yan, Di Zhang, Yan Fang, Yujie Chen, Qian Yu, Ge Wang, Heng Ouyang, Chen Fan, Qiang Guo, Ding -Bang Xiong, Shenbao Jin, Gang Sha, Nasr Ghoniem, Ze Zhang, Y. Morris Wang
Summary: Additive manufacturing enables self-stabilization of dislocations in metallic materials through heating-cooling cycles, resulting in a unique dislocation assembly that enhances material strength and steady strain hardening.
Article
Materials Science, Multidisciplinary
Qian Zhang, Ruirui Huang, Jiaxi Jiang, Tangqing Cao, Yongpan Zeng, Jianguo Li, Yunfei Xue, Xiaoyan Li
Summary: As a new class of revolutionary alloy materials, high entropy alloys (HEAs) have been extensively studied due to their unique composition, microstructures, and superior mechanical properties. This study focused on the deformation behavior and mechanisms of HEA single crystals at the micro/nanoscale, revealing different size effects and deformation mechanisms in crystals with different orientations, providing insights for the design and fabrication of high-strength HEAs with remarkable plasticity.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Chemistry, Physical
Tongfei Zou, Meng Liu, Yifan Cai, Quanyi Wang, Yunqing Jiang, Yunru Wang, Zhenheng Gao, Yubing Pei, Hong Zhang, Yongjie Liu, Qingyuan Wang
Summary: In this study, uniaxial tensile tests were conducted on additive manufacturing 939 superalloy at various temperatures to investigate its mechanical properties, fracture behaviors, and deformation mechanisms. The experimental results showed a significant decrease in yield, tensile strength, and elongation with increasing temperature. The fracture surfaces exhibited plastic fracture characteristics at room temperature and multiple slip systems were observed at higher temperatures. The deformation mechanism was primarily controlled by single slip system at room temperature, while thermal energy activated more slip systems and promoted dislocation movement at intermediate temperatures, and large-scale stacking faults and dislocation by-passing and climbing mechanisms were observed at high temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
J. Baton, W. Geslin, C. Moussa
Summary: The study analyzes the dislocation densities and substructures of various deformed microstructures of pure tantalum to investigate the influence of deformation conditions, highlighting the significant impact of orientation on the formation of dislocation substructures.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Apratim Chakraborty, Waqas Muhammad, Jean-Philippe Masse, Reza Tangestani, Morteza Ghasri-Khouzani, Andrew Wessman, Etienne Martin
Summary: In this study, the inherent micro-cracking mechanisms in two different high-γ' Ni-based superalloys processed by laser powder bed fusion (LPBF) were investigated. The REN & PRIME;E 65 (R65) alloy with a lower γ' volume fraction showed lower micro-cracking density compared to the REN & PRIME;E 108 (R108) alloy with a higher γ' volume fraction. The microcracks were found to propagate along high angle boundaries (HABs) and were predominantly caused by solidification cracking. This research also found that Hf and Zr segregation along the grain boundaries increased the susceptibility to micro-cracking.
Article
Nanoscience & Nanotechnology
Pengda Niu, Ruidi Li, Zhiqi Fan, Tiechui Yuan, Zhijiang Zhang
Summary: The metastable dual-phase Fe50Mn30Co10Cr10 high entropy alloy was prepared successfully using the laser melting deposition (LMD) technique. The as-printed samples showed anisotropic mechanical properties, with deformation bands observed in the FCC matrix after deformation. The formation of stacking faults and increase of dislocations were significantly influenced by sliding of Shockeley partial dislocations, contributing to the nucleation of HCP martensite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Engineering, Industrial
Samantha Webster, Hui Lin, Fred M. Carter, Kornel Ehmann, Jian Cao
Summary: The study defines hybrid additive manufacturing as a combination of additive manufacturing process and secondary energy sources, altering physical mechanisms to influence material properties. Through a systematic approach, the study identified five physical mechanisms and analyzed over 100 papers to show the effects of mechanisms on material properties. Future research directions include improving energy source variety, material diversity, process chain integration, and developing promising hybrid additive manufacturing processes.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Lei Tang, Oxana Magdysyuk, Fuqing Jiang, Yiqiang Wang, Alexander Evans, Saurabh Kabra, Biao Cai
Summary: This study reveals the mechanical and microstructural responses of a 316L ASS at low temperatures using in situ neutron diffraction tensile tests. The results show a linear decrease in stacking fault energy with temperature, leading to a transition in deformation mechanism.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
P. Snopinski
Summary: A submicrometer-grained microstructure was fabricated in an additively produced AlSi10Mg aluminium alloy through Equal Channel Angular pressing at 150 C. The alloy matrix exhibited predominant deformation mechanism of dislocation slip, and the heterogeneous microstructure activated another important mesoscale deformation mechanism – the plastic deformation gradient. TEM analysis provided evidence for deformation twinning of the hard Si phase and deformation-induced amorphisation of the Si phase. The synergy of different deformation modes leads to a good balance between strength and ductility and offers new possibilities for the development of structural materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jie Chen, Haiyang Wei, Kuo Bao, Xianfeng Zhang, Yang Cao, Yong Peng, Jian Kong, Kehong Wang
Summary: The study utilized the cold metal transfer (CMT) process to fabricate 316L stainless steel and compared its dynamic characteristics with annealed wrought 316L, finding that CMT 316L exhibited higher yield strength and flow stress at small strains due to a special cellular structure in the matrix. The study also showed that the average twin thickness of CMT 316L decreased with the increase of strain rates during dynamic compressions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Shuai Zhang, Shufang Ma, Xiaodong Hao, Qingming Liu, Yanyan Hou, Qingbo Kong, Zhaoru Chen, Hanyu Ma, Ting Xi, Yang Xu, Ben Cao, Lin Shang, Bin Han, Bingshe Xu
Summary: High-purity BP crystals were successfully synthesized by the CVT method in an aRP, Sn, and I-2 system. The synthesis of BP involved a three-stage structural transformation of aRP-P-4-Hittorf's P (HP)-BP, with crystallization kinetics explaining the nucleation mechanism and competitive nucleation between HP and BP enabling the bottom-up preparation of BP nanobelts.
Article
Chemistry, Physical
Yuhao Jia, Zhijun Wang, Feng He, Qingfeng Wu, Bin Gan, Junjie Li, Jincheng Wang
Summary: The recently emerged CoCrNi-based medium-entropy alloys (MEAs)/high-entropy alloys (HEAs) have a good combination of high strength and ductility. By revisiting the commercial superalloys MP35N and MP159, inspirations for designing CoCrNi-based MEAs can be found. The experiments showed that after a simple thermomechanical process, MP35N/MP159 can achieve high tensile strength at ambient temperature and intermediate temperature. Transmission electron microscope analysis revealed that alloying and thermomechanical treatments can significantly improve the performance of CoCrNi-based MEAs.
Article
Chemistry, Physical
Zhongsheng Yang, Zhijun Wang, Bojing Guo, Rongtian Cao, Qingfeng Wu, Dingcong Cui, Kaiwei Zhang, Junjie Li, Jincheng Wang, Feng He
Summary: This study investigated the effects of pre-strain degree on the precipitation behavior of Ni2CoCrFeTi0.18Al0.12 high-entropy alloys. The results revealed a non-monotonous effect of pre-strain on the precipitation behavior, where low pre-strain can accelerate the precipitation while high pre-strain weakens this effect. Additionally, pre-strain can control the precipitation strengthening, dislocation strengthening, and grain boundary strengthening of high-entropy alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Linfei Xia, Qingfeng Wu, Kexuan Zhou, Bin Han, Feng He, Zhijun Wang
Summary: This study developed a synergistically strengthened high-entropy alloy through concurrent recrystallization and precipitation approach, achieving excellent mechanical properties. The high-density gamma' precipitates were introduced in the matrix, while fully-recrystallized ultrafine grains and annealing twins were obtained. The deformation mechanisms were characterized by TEM, revealing that the cutting-through mechanism dominates the deformation behaviors.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Rong Liu, Feng He, Jun-Jie Li, Ying-Ying Dang, Zhi-Jun Wang, Jin-Cheng Wang
Summary: Hot deformation effectively tailors the hypoeutectic microstructure of CoCrFeNiNb0.25 high-entropy alloy, resulting in refined grains and uniformly distributed Laves phases, which improves its mechanical properties.
Article
Materials Science, Multidisciplinary
Bin Han, Feng He, Linfei Xia, Zhijun Wang, Ji Jung Kai
Summary: The effect of Ti/Al ratio on elemental partitioning in the Ni2CoFeCrTixAly high entropy alloy was studied, showing that decreasing Ti/Al ratio enhances the incorporation of Fe and Cr while reducing Co concentration in the gamma' nanoparticles.
FRONTIERS IN MATERIALS
(2022)
Article
Chemistry, Physical
Mei Lin, Zhongsheng Yang, Xinbo Shi, Yiming Chen, Jianlin Lu, Zhijun Wang, Junjie Li, Jincheng Wang, Feng He
Summary: In this study, an effective combination of solid solution strengthening and precipitation hardening was achieved in the NiCrFeWTiAl multi-principal element alloys. Through controlled elemental partitioning, good tensile properties were obtained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Dingcong Cui, Qingfeng Wu, Feng Jin, Chenbo Xu, Mingxin Wang, Zhijun Wang, Junjie Li, Feng He, Jinglong Li, Jincheng Wang
Summary: A defect-free Ti2AlNb joint has been obtained using inertia friction welding technology. The weld zone consists of B2 grains refined by discontinuous dynamic recrystallization and enhanced by grain refinement strengthening. The heterogeneous structure of the joint causes strong strain partitioning during tensile deformation, leading to microcrack initiation and premature fracture in the heat-affected zone.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Optics
Jiankai Ma, Junjie Li, Yashan Zhang, Yue Li, Zhijun Wang, Feng He, Jincheng Wang
Summary: This study investigates the microstructural evolution mechanism of the heat affected zone (HAZ) in Ti alloy forging-additive hybrid manufacturing. The results show that patchy alpha m forms in the previous equiaxed alpha region of HAZ in single-pass samples, while needle-like martensite alpha' forms in the previous lamellar alpha regions close to the equiaxed alpha region. In multi-pass deposition, some alpha m grains can remain and evolve into large-sized alpha m within the previous equiaxed alpha region in the next heat cycle.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Applied
Fangyan Zhu, Jianlin Lu, Pengkun Liu, Haoran Ma, Rongtian Cao, Feng He, Jincheng Wang, Qiangang Fu
Summary: The solid solution hardening effect of V in the NiCoV system was investigated. Results showed that the solid hardening mechanism changes from lattice distortion to atomic volume mismatch when the V content exceeds 6 at. %. Increasing V content significantly increases the Hall-Petch coefficient of NiCoV MEAs, resulting in excellent yield strength.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Dingcong Cui, Yuyu Zhang, Linxiang Liu, Yue Li, Lei Wang, Zhijun Wang, Junjie Li, Jincheng Wang, Feng He
Summary: A refractory high-entropy alloy with room-temperature ductility is achieved through the nanoscale spinodal structure, resulting in the highest tensile yield strength and good elongation. Oxygen is found to play a dominant role in controlling the formation of the spinodal structure. This study provides a novel strategy to improve the mechanical properties of refractory high-entropy alloys and deepens the understanding of their phase stabilities.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Linxiang Liu, Zhijun Wang, Qingfeng Wu, Yuhao Jia, Q. Xu, Feng He, Junjie Li, Jincheng Wang
Summary: A dual-phase high entropy alloy with FCC and B2 matrix was developed, showing excellent high-temperature mechanical properties. The hierarchical microstructure contributed to high yield strength and good tensile elongation at a wide temperature range, making it a potential material for high-performance applications.
SCRIPTA MATERIALIA
(2023)