Article
Engineering, Multidisciplinary
Pengcheng Huo, Zhanyong Zhao, Wenbo Du, Zhen Zhang, Peikang Bai, Di Tie
Summary: In this study, TiC/TC4 alloy nanocomposites were successfully fabricated using the selective laser melting (SLM) process, and the deformation strengthening mechanism of Ti matrix reinforced with TiC nanoparticles was investigated in depth. The results showed that nanoscale TiC reinforcement promoted the formation of deformation twinning, maintaining an orderly arrangement of atoms in the TiC/TC4 alloy nanocomposites during deformation. Additionally, a dual strengthening mechanism involving severe lattice distortion and deformation twinning was proposed to describe the occurrence of dislocation pinning effects.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Chemistry, Physical
Yidi Li, Xiaobo Yuan, Biaobiao Yang, Xianjue Ye, Ping Zhang, Haoyu Lang, Qian Lei, Jiantao Liu, Yunping Li
Summary: A near-full dense Cu-36.8Fe alloy was manufactured by selective laser melting, showing excellent mechanical performances due to the unique hierarchical microstructures. These findings provide insights for applying SLM technique to other immiscible alloys to design for higher mechanical performances.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Bolun Han, Chengcheng Zhang, Kai Feng, Zhuguo Li, Xiancheng Zhang, Yao Shen, Xiaodong Wang, Hiroyuki Kokawa, Ruifeng Li, Zhiyuan Wang, Paul K. Chu
Summary: The study fabricated a near full-dense hierarchical CrCoNi medium entropy alloy (MEA) using selective laser melting (SLM), achieving superior yield strength at 77K. The high strength of the material stems from a hierarchical microstructure composed of high-density dislocations and low-angle grain boundaries (LAGB). The results suggest that SLM is a viable technique for fabricating dense hierarchical CrCoNi MEA and offer a design strategy to further improve mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yacheng Fang, Pan Ma, Shuimiao Wei, Zhiyu Zhang, Dongye Yang, Hong Yang, Shiguang Wan, Konda Gokuldoss Prashanth, Yandong Jia
Summary: The trade-off between strength and ductility in alloys has been a persistent issue in engineering applications. Conventional techniques often sacrifice ductility to increase strength, while high entropy alloys with dual-phase structures exhibit excellent strength-ductility synergy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Biliang Yuan, Chuanqiang Li, Yong Dong, Yang Yang, Peng Zhang, Zhengrong Zhang
Summary: The as-printed Al0.3CoCrFeNiCu high-entropy alloy (HEA) was successfully fabricated using selective laser melting (SLM) technology. The SLM-processed HEA exhibited a simple disordered face centered cubic solid solution with excellent mechanical properties. However, the presence of defects in the SLM alloy limits its application.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
J. B. Gao, D. D. Ben, H. J. Yang, L. X. Meng, H. B. Ji, D. L. Lian, J. Chen, J. L. Yi, L. Wang, P. Li, Z. F. Zhang
Summary: This study investigates the rapid hardening and softening of SLM-Ti6Al4V alloy through electropulsing treatment, which affects the microhardness by evolving microstructures. Electropulsing treatment reduces the thermodynamic barrier for α->β solid-state phase transformation, further refining the microstructure of the SLM-Ti6Al4V alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
J. X. Fang, J. X. Wang, Y. J. Wang, H. T. He, D. B. Zhang, Y. Cao
Summary: A high-entropy alloy with inhomogeneous chemical composition was prepared using laser powder deposition, and its microstructure and properties were compared with a compositionally homogeneous alloy prepared via electric arc melting + hot forging. The results showed that the laser-deposited alloy had higher yield strength, tensile strength, and elongation, as well as better plasticity under high strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhiguang Zhu, Fern Lan Ng, Hang Li H. Seet, Wenjun Lu, Christian Liebscher, Ziyuan Rao, Dierk Raabe, Sharon Mui Ling Nai
Summary: By utilizing selective laser melting and heat treatment, high-strength AlZnMgCuScZr alloys with an unprecedented strength-ductility synergy were successfully fabricated, paving the way for designing and fine-tuning SLM-produced aluminum engineering components exposed to high mechanical loads.
Article
Nanoscience & Nanotechnology
Chunlei Qiu, Qi Liu, Rengen Ding
Summary: A beta titanium alloy, Ti-10V-2Fe-3Al, was processed by pulsed selective laser melting to fabricate samples with high strength and ductility. Dislocation slipping was identified as the dominant deformation mechanism during tensile testing, with the high yield strength attributed to the suppression of transformation and the fine grain and cell structures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
S. L. Lu, Z. J. Zhang, R. Liu, Z. Qu, B. Wang, X. H. Zhou, J. Eckert, Z. F. Zhang
Summary: The prior beta grain evolution and phase transformation of selective laser melted (SLM) Ti6Al4V alloy after subtransus and supertransus solution heat treatments were investigated. A method based on the special angle grain boundaries was proposed for describing the prior beta mesostructure. Subtransus treatments retained the prior beta grains and altered the martensitic microstructure into a mixture of alpha and alpha'/beta phases. Supertransus treatments resulted in the growth of prior beta grains and transformation of martensitic alpha' phases into beta phases, followed by a transformation back into alpha' martensites during quenching, leading to a new martensitic microstructure. The microhardness was mainly influenced by the amount of alpha' martensite.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Pengfei Gu, Tengbo Qi, Lan Chen, Tong Ge, Xudong Ren
Summary: Refractory high entropy alloys (RHEAs) have excellent heat tolerance and mechanical properties, making them a promising direction for high-temperature structural materials. In this study, bulk VNbMoTaW RHEA was fabricated using selective laser melting (SLM), and the impact of laser scanning speed on its surface morphology, internal defect, microstructure, and mechanical properties was investigated. The results showed that pores and cracks were the main defects in the SLMed VNbMoTaW RHEA, with lower scanning speeds reducing the presence of pores but the manifestation of cracks remaining inevitable. The microstructure revealed the existence of a columnar dendritic structure and a cellular structure on the top surface, while the average microhardness and compressive strength of the SLMed VNbMoTaW RHEA were higher than those processed by arc-melting.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xiquan Jia, Zhenlin Xu, Yizhu He, Shengxuan Zhou, Xiaojie Du, Hui Zhang, Aiqin Mao
Summary: This study investigates the microstructure and oxidation behavior of the CoCrFeMnNi high-entropy alloy (HEA) prepared by selective laser melting (SLM). Annealing after the SLM process significantly improves the alloy's structure and oxidation resistance. Therefore, subsequent heat treatment plays a crucial role in enhancing the performance of the alloy.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yiyu Huang, Zhonghao Xie, Wenshu Li, Haoyu Chen, Bin Liu, Bingfeng Wang
Summary: In this study, dynamic impact experiments were conducted to investigate the dynamic mechanical properties of SLM-NiCrFeCoMo0.2 high entropy alloy (HEA) with different molten pool sizes. The results showed that SLM-NiCrFeCoMo0.2 HEA exhibited high impact energy absorption density and compressive strength at high strain rates. The relationship between molten pool structure and precipitation distribution was studied to understand the contribution of precipitation strengthening to the material's strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Enrico Gianfranco Campari, Angelo Casagrande
Summary: The equiatomic high entropy alloy (HEA) of CrNiFeCoMn composition exhibits different microstructures and mechanical properties under different temperature conditions. At low and intermediate temperatures, the alloy behaves as a supersaturated solid solution with the presence of nitrides and σ nanostructures. However, at high temperatures, the alloy transforms into a single crystal structure with the disappearance of nitride and σ phase precipitates.
Article
Chemistry, Physical
Young-Kyun Kim, Ji-Eun Ahn, Yongwook Song, Hyunjoo Choi, Sangsun Yang, Kee-Ahn Lee
Summary: The Y2O3-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite, fabricated through high-energy attrition milling and selective laser melting (SLM) additive manufacturing, exhibited superior mechanical properties with higher nanohardness compared to similar HEAs produced by casting and SLM. This suggests that dispersion hardening by Y2O3 nanoparticles can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.
Article
Materials Science, Multidisciplinary
Jianying Wang, Jianpeng Zou, Hailin Yang, Xixi Dong, Peng Cao, Xiaozhou Liao, Zhilin Liu, Shouxun Ji
Summary: Superior mechanical properties have been achieved in a coarse-grained single-phase face-centered cubic (fcc) medium-entropy alloy (MEA) by carefully designing multi-scale heterogeneous structures. The alloy exhibits high ultimate tensile strength and fracture strain, mainly attributed to the favorable heterogeneous fcc matrix, coherent spherical precipitates, and a high density of crystalline defects.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhufeng He, Yanxin Guo, Lifang Sun, Xianjun Guan, Shuang Jiang, Yongfeng Shen, Wen Yin, Xiaoli Zhao, Zhiming Li, Nan Jia
Summary: This study presents a universal strategy for designing ultrastrong and ductile face-centered cubic (fcc) multicomponent alloys by introducing interstitial-driven local chemical order (LCO) through simple thermomechanical processing. Fine laths containing interstitial-driven LCO domains have been observed in a prototype FeMnCoCrN alloy, resulting in an ultra-high yield strength of 1.34 GPa and a uniform elongation of 13.9%. This design strategy has also been successfully applied to a multicomponent austenitic steel, suggesting its potential in developing high-performance fcc materials at low cost.
Article
Materials Science, Multidisciplinary
Penghua Ge, Kefu Gan, Dingshun Yan, Pengfei Wu, Weisong Wu, Zhiming Li
Summary: This study reports an anomalous low-temperature annealing-induced hardening behavior in a prototype equiatomic FeCoNi medium-entropy alloy subjected to severe cold-rolling deformation. The hardening phenomenon is confirmed by microhardness measurements and tensile tests, and is correlated with the annealing-modified nanosubgrained structure. The reduction of distribution heterogeneities of shear bands and nanosubgrains upon annealing contributes to the relief of strain localization during plastic yielding. The rearrangement of nanosubgrains upon annealing also relieves the severe heterogeneity of nanohardness distribution, resulting in higher macroscopic strength and hardness. This novel annealing-induced hardening phenomenon provides a guideline for optimizing the thermomechanical treatment strategies of FeCoNi medium-entropy alloys to enhance their mechanical properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Mengrui Li, Shiqiang Zhou, Lukuan Cheng, Funian Mo, Lina Chen, Suzhu Yu, Jun Wei
Summary: This review focuses on the technologies and materials used in 3D-printed supercapacitors (SCs), and highlights the structure design principles of electrodes and devices. It summarizes the practical applications of SCs and discusses potential research directions for the future.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhengxiong Su, Jun Ding, Miao Song, Li Jiang, Tan Shi, Zhiming Li, Sheng Wang, Fei Gao, Di Yun, En Ma, Chenyang Lu
Summary: In this study, carbon and nitrogen were introduced into the NiCoFeCrMn high-entropy alloy to create chemical heterogeneities, resulting in reduced void swelling. The findings suggest that alloying with interstitial elements can improve radiation tolerance in high-entropy alloys.
Article
Chemistry, Physical
Yong Zhang, Pengfei Wu, Yu Lu, Xun Cao, Yizhong Huang, Vincent Gill, Zhiming Li
Summary: The atomic-scale structures of Z-plates in a Zr-alloyed Sm2Co17-type magnet were investigated using aberration-corrected STEM. Zr preferentially replaces dumbbell Sm to form (Sm1/3Zr2/3)Co3 Z-plates, which contribute to the enhancement of magnet performance. Different stacking types of Z-plates were observed, some of which exceed the thickness of double 2/3-stacking and degrade the oxidation resistance of the magnet. The diffusion-controlled mechanisms for the phase transformation from the 2:17R matrix to the 1:3R Z-plates were unraveled.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zizheng Song, Ranming Niu, Xiangyuan Cui, Elena V. Bobruk, Maxim Yu. Murashkin, Nariman A. Enikeev, Ji Gu, Min Song, Vijay Bhatia, Simon P. Ringer, Ruslan Z. Valiev, Xiaozhou Liao
Summary: Superplastic deformation of polycrystalline materials is usually achieved by diffusion-assisted grain boundary sliding at high temperatures. Recent research has shown that room-temperature superplasticity can be achieved in ultrafine-grained Al-Zn based alloys, but the underlying mechanism is still unclear. This study utilized in-situ tensile straining, electron microscopy characterization, and atomistic density functional theory simulation to reveal that the superplasticity at room temperature is achieved by grain boundary sliding and grain rotation, facilitated by the continuous diffusion of Zn. The diffusion of Zn atoms from grains to grain boundaries forms a Zn nanolayer, acting as a solid lubricant to lower the energy barrier of grain boundary sliding.
Article
Materials Science, Multidisciplinary
Wenjun Lu, Wenqi Guo, Zhangwei Wang, Jianjun Li, Fengchao An, Gerhard Dehm, Dierk Raabe, Christian H. Liebscher, Zhiming Li
Summary: In this study, a novel strategy is developed to mitigate the embrittlement of sigma phase particles in high-entropy alloys (HEAs) by utilizing displacive transformation and heterogeneous structures. The deformation behavior study reveals that the displacive transformation from face-centered cubic (FCC) to hexagonal close packed (HCP) phase effectively suppresses the propagation of microcracks in brittle sigma particles and contributes to high work hardening behavior. The transformation induced stress-relaxation around the regions containing brittle sigma particles in heterogeneously structured HEAs results in ultimate tensile strengths as high as -1.2 GPa while maintaining a ductility up to -50%.
Letter
Materials Science, Multidisciplinary
Hao Zhang, Bingqiang Wei, Xiaoqin Ou, Song Ni, Xiaozhou Liao, Min Song
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Wei Jiang, Heng Wang, Zhiming Li, Yonghao Zhao
Summary: A carbon-nitrogen co-doped interstitial high entropy alloy (iHEA) with excellent mechanical properties was prepared. By optimizing the microstructures through cold-rolling and annealing treatments, the iHEA exhibited ultrafine grains and nanoprecipitates, resulting in high hardness and tensile strength. While sacrificing some ductility, the iHEA maintained good mechanical properties even after annealing.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Tingting Song, Zibin Chen, Xiangyuan Cui, Shenglu Lu, Hansheng Chen, Hao Wang, Tony Dong, Bailiang Qin, Kang Cheung Chan, Milan Brandt, Xiaozhou Liao, Simon P. P. Ringer, Ma Qian
Summary: This study demonstrates a series of titanium-oxygen-iron compositions with outstanding tensile properties, achieved through alloy design and additive manufacturing. These alloys, strengthened by the abundant elements of oxygen and iron, offer potential for diverse applications and the industrial-scale use of waste sponge titanium. Additionally, they have significant economic and environmental potential for reducing the carbon footprint of energy-intensive sponge titanium production.
Article
Materials Science, Multidisciplinary
Zhenghong Fu, Yong Zhang, Zhiming Li, Yiping Lu, Xiaoxiang Wu, Hui Wang
Summary: This study reports the development of a selectively laser melted eutectic high-entropy alloy with ultrahigh strength and good ductility through tuning micro-to nano-scale heterogeneous microstructures. The nano-sized B2 and L12 phases effectively hinder dislocation motion and improve strength, while the face-centered cubic matrix ensures uniform deformation and the Cr-rich clusters alleviate possible brittle failure of the hard B2 phase.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Kefu Gan, Dingshun Yan, Yong Zhang, Zhiming Li
Summary: Low SFE nanocrystalline alloys with PNTs and HGS exhibit exceptional strength-ductility combinations. HGS promotes strain partitioning and strain localization, while PNTs alleviate strain localization and facilitate homogeneous deformation. PNTs block intragranular mobile Shockley partials and enhance dislocation reaction probability, increasing the densities of sessile SSDs.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Jiaojiao Hu, Qiankun Yang, Shuya Zhu, Yong Zhang, Dingshun Yan, Kefu Gan, Zhiming Li
Summary: This study demonstrates a metastability engineering strategy for toughening superhard high-entropy carbides (HECs) by introducing in-situ metastable ceramic particles. The transformation of metastable tetragonal ZrO2 particles under mechanical loading promotes crack tip shielding mechanisms, leading to enhanced fracture toughness of the HECs.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Pengfei Wu, Yong Zhang, Liuliu Han, Kefu Gan, Dingshun Yan, Weisong Wu, Lunhua He, Zhenghong Fu, Zhiming Li
Summary: In this study, a newly developed non-equiatomic high-entropy alloy with an ultra-low stacking fault energy was investigated. It was found that the formation of martensite transformation was suppressed due to the presence of chemical short-range order and atomic size misfit, leading to enhanced plastic deformation ability and ductility in the alloy.
