Article
Nanoscience & Nanotechnology
Chengzhe Wang, Yunlong Hu, Chen Zhong, Cunxiao Lan, Wei Li, Xiaojian Wang
Summary: There is limited research on the microstructure formation mechanism and microstructure evolution of selective laser melting (SLM) of pure Zn. This study optimized the process parameters of SLM pure Zn and investigated their effect on the mechanical properties. It was found that the strength and ductility of SLM Zn improved with increasing laser energy density. The microstructure of SLM pure Zn consisted of equiaxed grains and lamellar structure. The formation of equiaxed grains was attributed to the low temperature gradient and high scanning speed of SLM pure Zn.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Tom McKenna, Charles Tomonto, Greg Duggan, Eoin Lalor, Seamus O'Shaughnessy, Daniel Trimble
Summary: As-built, SLM-printed Ti-6Al-4V parts have brittle microstructures due to the formation of metastable a'-phase martensite. Post-processing heat treatments are needed to alleviate residual stress and decompose the martensite. This research evaluates the effect of unconventional 'cyclical' heat treatment parameters on grain morphology, phase composition, and mechanical performance, and compares it to a typical lamellar microstructure.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Anru Yan, Abbas Mirza Atif, Xiaobo Wang, Tian Lan, Zhiyong Wang
Summary: This study investigates the key factors influencing the selective laser melting (SLM) fabrication of pure molybdenum. By optimizing the processing parameters, pure molybdenum with a relative density of 99.1% is successfully fabricated. The formation mechanisms of different structures are analyzed, revealing that an interlocking grain boundary structure and stretch columnar grains can enhance bonding force and inhibit crack growth. Additionally, balling and cracking can be reduced by adding support structures and suppressing oxygen content. The SLM-fabricated molybdenum exhibits higher hardness and bending strength compared to conventionally manufactured molybdenum, thanks to its fine grains and dislocation strengthening during the SLM process. This study provides a new approach for fabricating refractory metals with complex structures.
Article
Nanoscience & Nanotechnology
Jian Chen, Xingyu Liao, Jingguo Shu, Libo Zhou, Cong Li, Yanjie Ren, Yan Niu
Summary: The study systematically investigated the SLM of Ti-15Mo alloy, particularly focusing on densification, microstructure, and mechanical properties. The samples processed by SLM exhibit a greater combination of high tensile strength and elongation due to the retention of omega phase, high dislocation density, finer grains, twinning-induced plasticity, and changes in texture orientation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Peng Qi, Bolong Li, Tongbo Wang, Lian Zhou, Zuoren Nie
Summary: The study on microstructural homogeneity evolution of beta phases in different regions of SLM Ti-6Zr-5Fe alloy samples reveals significant differences in size, morphology, crystallographic orientation, and microhardness. The top region shows higher microhardness compared to the middle and bottom regions. Temperature gradients, cooling rates, and reheating treatment play different leading roles in various regions of the SLM Ti-6Zr-5Fe alloy sample.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Peng Qi, Bolong Li, Wu Wei, Jimin Chen, Tongbo Wang, Hui Huang, Kunyuan Gao, Shengping Wen, Xiaolan Wu, Li Rong, Wenjun Wu, Lian Zhou, Zuoren Nie
Summary: This study aims to investigate the influence of laser power on the microstructural evolution of a novel Ti-6Zr-5Fe alloy fabricated by selective laser melting (SLM). The microstructural evolutions of the top surfaces in SLM Ti-6Zr-5Fe alloy samples fabricated from 80 W to 140 W were thoroughly examined. The increase in laser power resulted in larger size of the b phase and a phase due to decreased cooling rate, as well as increased melt pool overlapping, leading to re-heating or re-melting. The findings demonstrate that laser power can effectively regulate and control the microstructure and microhardness of SLM Ti alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
J. Karimi, M. S. Xie, Z. Wang, K. G. Prashanth
Summary: The study explores the effects of melting sequence on the microstructure, substructure, and mechanical properties of SLM Ti6Al4V alloys. Results show that increasing melting sequence leads to higher density of twins and dislocations, as well as improved tensile strength properties.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Seung Jun Han, Gyung Bae Bang, Won Rae Kim, Gun Hee Kim, Hyun-Su Kang, Hyuk Su Han, Taeg Woo Lee, Hyung Giun Kim
Summary: This study investigates the correlation between the microstructure and mechanical properties of pure Ti specimens manufactured by selective laser melting (SLM) and the effect of stress relief heat treatment. The study finds a clear relationship between mechanical properties and microstructural changes in SLM-manufactured pure Ti after heat treatment and confirms the effectiveness of heat treatment in relieving residual stress.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Yu Zhao, Changyi Wu, Shengfeng Zhou, Junjie Yang, Wei Li, Lai-Chang Zhang
Summary: Electrochemical measurements and microstructural analysis were conducted to study the corrosion behavior and formation mechanism in Ti-TiN composites produced by SLM and CP-Ti. Compared to CP-Ti, the Ti-TiN composites exhibit higher corrosion resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jincheng Wang, Yujing Liu, Chirag Dhirajlal Rabadia, Shun-Xing Liang, Timothy Barry Sercombe, Lai-Chang Zhang
Summary: This study investigates the microstructure and mechanical properties of a SLM-produced Ti-35Nb composite using elemental powder, revealing the benefits of solid-solution treatment in enhancing chemical homogeneity and bonding strength. Analyses of tensile fractures and shear bands confirm the correlation between different phases and the ductility of Ti-35Nb.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jiming Lv, Kaiyu Luo, Haifei Lu, Zhao Wang, Jiajun Liu, Jinzhong Lu
Summary: This research investigated the influences of laser shock peening (LSP) on the residual stress state, microstructures, and mechanical properties of Ti-6Al-4V alloy fabricated by selective laser melting (SLM). The results showed that LSP treatment adjusted the residual stress from tensile to compressive state and promoted the formation of high-density dislocations and parallel nano mechanical twins (nano-MTs) in the coarse lamellar alpha' structures, resulting in grain refinement. The ultimate tensile strength and elongation of the SLMed Ti-6Al-4V alloy increased by approximately 14.3% and 18.3% after LSP treatment, respectively. The study revealed that the combination of high levels of compressive residual stress and grain refinement achieved by LSP contributed to the enhancement of both strength and ductility in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Libo Zhou, Xisheng Bi, Jinshan Sun, Zhiming Hu, Cong Li, Jian Chen, Yanjie Ren, Yan Niu, Wei Qiu, Wei Chen
Summary: In this study, the Ti-15Mo alloy produced by selective laser melting (SLM) with different support heights was investigated for the first time. It was found that increasing the support height led to a higher risk of microcrack and small hole formation, as well as a decrease in sample ductility. The grain size of the samples decreased with increasing support height, which was attributed to the higher heat dissipation rate during the SLM process. Additionally, the intensity of the (111) texture increased and misorientation angles gradually decreased with increasing support height. The ultimate tensile strength, yield strength, and ductility of the samples also increased as the support height increased.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Qipeng Wang, Jian Kong, Xiangkui Liu, Kewei Dong, Xinxiang Song, Yang Yang, Junqiang Xu, Xinsheng Chen
Summary: Low-temperature vacuum heat treatment can reduce thermal deformation in metals, and the Ti-6Al-4V alloy manufactured by selective laser melting shows high strength and good ductility after heat treatment at 550 degrees C for 4 hours. The precipitation of more beta phases and the presence of twins enhance the plasticity of the alloy, but higher temperatures can lead to coarser precipitated phases and decreased strength.
Article
Materials Science, Multidisciplinary
Seong Ho Lee, Jinyeong Yu, Seho Cheon, Jung Gi Kim, Taekyung Lee
Summary: This research compares the microstructure and microhardness of Ti-6Al-4V alloy fabricated by selective laser melting using electropulsing treatment and conventional furnace heat treatment. The results show that electropulsing treatment can eliminate columnar microstructures, refine beta-grains, and effectively improve the microstructural inhomogeneity.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Jiang Ju, Jing-jing Li, Min Jiang, Meng-ya Li, Li-xiang Yang, Kai-ming Wang, Chao Yang, Mao-dong Kang, Jun Wang
Summary: Ti-6Al-4V alloy fabricated via selective laser melting shows better corrosion resistance than wrought samples due to its unique microstructure and uniform distribution of alloying elements.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Nanoscience & Nanotechnology
Baicheng Zhang, Pei Wang, Youxiang Chew, Yaojie Wen, Maohang Zhang, Pan Wang, Guijun Bi, Jun Wei
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Engineering, Manufacturing
Yaojie Wen, Baicheng Zhang, Shuying Liu, Wei Cai, Pei Wang, Coryl Jing Jun Lee, Junda Ma, Xuanhui Qu
VIRTUAL AND PHYSICAL PROTOTYPING
(2020)
Review
Metallurgy & Metallurgical Engineering
Cai Jia-wei, Zhang Bai-cheng, Zhang Mao-hang, Wen Yao-jie, Qu Xuan-hui
Summary: Indirect 3D printing divides the one-step forming process of direct 3D printing into binding and material sintering, avoiding internal stress caused by rapid cooling, making it possible to achieve high-quality ceramic components with complex shapes.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Engineering, Manufacturing
Yaojie Wen, Baicheng Zhang, Ramasubramanian Lakshmi Narayan, Pei Wang, Xu Song, Hao Zhao, Upadrasta Ramamurty, Xuanhui Qu
Summary: A novel method for LPBF of large-scale compositionally graded alloy components was devised and demonstrated in this study, showing defect-free samples with smooth end-to-end variations in composition and microstructures. This method has the potential to be extended to other material combinations for creating high quality CGA components.
ADDITIVE MANUFACTURING
(2021)
Article
Nanoscience & Nanotechnology
Siyuan Wei, Kwang Boon Lau, Jing Jun Lee, Fengxia Wei, Wei Hock Teh, Baicheng Zhang, Cheng Cheh Tan, Pei Wang, Upadrasta Ramamurty
Summary: This study employed selective laser melting technique to fabricate a step-wise compositionally graded Fe-Al alloy coupon, which showed different grain structure evolution and hardness variations in different Al content regions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Maohang Zhang, Baicheng Zhang, Yaojie Wen, Xuanhui Qu
Summary: This paper introduces the application studies of selective laser melting in the field of nickel-based superalloys, including the strengthening mechanism and phase change evolution, the influence of laser parameters and heat treatment process on mechanical properties, as well as the industrial applications and future prospects.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Engineering, Manufacturing
Shuo Qu, Junhao Ding, Jin Fu, Mingwang Fu, Baicheng Zhang, Xu Song
Summary: The study developed a high-precision LPBF system for the fabrication of pure copper components with full densification, high resolution, and low roughness at a relatively low laser power. By optimizing parameters, pure copper parts with a relative density of 99.6% and an electrical conductivity of 76.1% IACS were successfully fabricated, which could be further increased to 96% IACS after heat treatment. The hp-LPBF demonstrated its capability to print finer and smoother pure copper parts with the same level of relative density and properties compared to conventional LPBF.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Jiawei Ma, Baicheng Zhang, Yu Fu, Xiaojun Hu, Xinfeng Cao, Zhimin Pan, Ya Wei, Hong Luo, Xiaogang Li
Summary: This study investigated the influence of cold deformation on the microstructure evolution and corrosion behavior of SLMed 316L stainless steel in a simulated cathode environment for PEMFCs. The results showed that the corrosion resistance improved with increasing deformation levels, but decreased at 70% deformation due to decreased stability of the passive film.
Article
Chemistry, Physical
Qiqi Li, Baicheng Zhang, Yaojie Wen, Gang Chen, Yanhui Wang, Pei Wang, Xuanhui Qu
Summary: In this study, sodium reduced tantalum (Ta) powders were processed using different methods to improve processing performance for additive manufacturing. Jet milling and plasma spheroidization were found to significantly improve the flowability of Ta powders. Additionally, plasma spheroidization powders exhibited better laser absorption capacity and a wider range of printing parameters.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Gang Chen, Shuying Liu, Chao Huang, Yuan Ma, Ying Li, Baicheng Zhang, Lei Gao, Bowei Zhang, Pei Wang, Xuanhui Qu
Summary: This study controls the composition of B2/B19' phases in NiTi components using LPBF, conducts electrochemical testing, and finds that the as-printed sample demonstrates better corrosion resistance, with a much stronger pitting corrosion resistance for the full B2 phase sample.
Review
Chemistry, Physical
Zhuping Ouyang, Wanxia Wang, Mingjiang Dai, Baicheng Zhang, Jianhong Gong, Mingchen Li, Lihao Qin, Hui Sun
Summary: This paper summarizes the structure and performance of p-Type oxide TFTs and discusses the progress and challenges in oxide transistor research. The microstructures of three types of p-Type oxides and significant efforts to improve the performance of oxide TFTs are highlighted. Finally, the latest progress and prospects of oxide TFTs based on p-Type oxide semiconductors and other p-Type semiconductor electronic devices are discussed.
Article
Materials Science, Multidisciplinary
Zequn Zhang, Jin'e Sun, Jiuyang Xia, Junsheng Wu, Zhibin Chen, Baicheng Zhang, Ziqi Li, Xiaogang Li, Bowei Zhang
Summary: Corrosion behavior on both the building plane and building direction plane of LPBF Al-Mn-Mg-Sc-Zr alloy was investigated. Localized corrosion primarily occurred at the molten pool boundaries, where abundant micro-cathode precipitates played a dominant role.
Article
Engineering, Manufacturing
Siyuan Wei, Punit Kumar, Kwang Boon Lau, Delvin Wuu, Laura-Lynn Liew, Fengxia Wei, Siew Lang Teo, Augustine Cheong, Chee Koon Ng, Baicheng Zhang, Cheng Cheh Tan, Pei Wang, Upadrasta Ramamurty
Summary: This study investigates the effects of different heat treatments on M350 maraging steel and reveals the relationship between LPBF process characteristics and martensitic transformation. The unique cellular structures play a significant role in influencing the alloy properties.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Jiawei Cai, Baicheng Zhang, Xuanhui Qu
Summary: The metal binder jetting technology has great potential for low-cost batch manufacturing. However, the use of phenolic-based binders restricts its application due to their hazardous nature and high residual content. In this study, an environmentally friendly PVA-based binder with high water content was developed to enable good bonding between powder layers. A fully dense SS316L part with low carbon and oxygen residuals was obtained, exhibiting isotropic tensile properties with high elongation.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jin'e Sun, Yaojie Wen, Zhong Wang, Jingguo Zhang, Linshan Wang, Xuanhui Qu, Baicheng Zhang
Summary: In this study, a TiC nanoparticle modified Al-Mg-Li alloy is developed for laser powder bed fusion (LPBF) process. The presence of TiC nanoparticles effectively increases the viscosity of the alloy liquid, preventing Li element ablation and promoting grain refinement. The addition of TiC nanoparticles leads to an outstanding mechanical property with high ultimate tensile strength and elongation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.
