Article
Chemistry, Physical
Longjian Li, Huijun Kang, Siruo Zhang, Rengeng Li, Xiong Yang, Zongning Chen, Enyu Guo, Tongmin Wang
Summary: The Cu-1Cr-0.2Zr (wt%) alloys with trace Mg (0.05 wt%) were prepared using a two-step cryorolling and aging (CRA) process. The effects of the CRA process and Mg element on microstructural evolution, mechanical properties, and electrical conductivity were investigated. The two-step CRA process resulted in the formation of high-density deformation twins and dislocations, while the addition of Mg element decreased the widths of deformation bands and twins. The fine precipitates and depletion of Cr and Zr elements contributed to the enhanced performance of Cu-Cr-Zr-Mg alloys, achieving high tensile strength and electrical conductivity simultaneously.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Bin Cheng, Ling Wang, David J. Sprouster, Jason R. Trelewicz, Weicheng Zhong, Ying Yang, Steven J. Zinkle, Lance L. Snead
Summary: This study produced a Cu-Cr-Nb-Zr alloy using direct current sintering with tailored precipitate distributions to enhance stability and creep resistance. The alloy exhibited a multi-modal precipitate distribution containing various sizes and types of precipitates, resulting in high hardness and retained thermal conductivity.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
Zhenmin Lai, Kangzhen Peng, Beibei Gao, Yongjin Mai, Xiaohua Jie
Summary: An economical and practical thermo-mechanical treatment process is desired for achieving a good combination of strength and conductivity in copper alloys. In this study, a new multi-stage treatment method involving pre-rolling with small strain and short-time aging before secondary rolling and aging is implemented in Cu-Cr-Zr alloys. The results show that the strength and ductility are improved with only a slight decrease in electrical conductivity compared to conventional single-stage treatment. The pre-rolling and pre-aging processes lead to the formation of dense, dispersive, and stable shear bands with high dislocation density and fine grains. Dislocation strengthening contributes to increased yield strength, while the heterostructure comprised of microstructures inside and outside the shear bands provides good tensile plasticity. This study sheds light on the development of a simplified and cost-saving thermo-mechanical treatment process for Cu-Cr-Zr alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
O. V. Rybalchenko, N. R. Bochvar, G. V. Rybalchenko, N. S. Martynenko, N. Yu. Tabachkova, S. V. Dobatkin
Summary: The kinetics of phase precipitation during aging in Cu-Cr-Hf and Cu-Cr-Zr alloys after high pressure torsion (HPT) was studied. The effect of HPT on the kinetics of aging was revealed by differential scanning calorimetry (DSC), microhardness, and electrical resistivity measurements. Analysis of the microstructure and phase precipitation using transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) showed the presence of Cu matrix, chromium, and zirconium- or hafnium-rich phases. Higher degree of hardening was observed in the Cu-Cr-Hf alloy compared to the Cu-Cr-Zr alloy after HPT and subsequent aging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jee Hyuk Ahn, Seung Zeon Han, Eun-Ae Choi, Geun Young Lee, Kwangho Kim, Jehyun Lee, Heung Nam Han
Summary: Controlling the distribution of DP and CP in Cu alloy can significantly widen the range of strength and electrical conductivity, thereby improving the performance of the alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Junqing Han, Yuying Wu, Kai Zhao, Sida Liu, Tong Gao, Xiangfa Liu
Summary: The effect of trace B on the properties and microstructure of Cu-Cr-Zr alloy was investigated in this work. It was found that B can accelerate the precipitation rate of Cr and promote the formation of coherent G.P zones in the alloy. In addition, the addition of trace B improves the hardness and electrical conductivity of the alloy, with 0.03wt% B showing the peak performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Natalia Martynenko, Olga Rybalchenko, Anna Bodyakova, Dmitriy Prosvirnin, Georgy Rybalchenko, Mikhail Morozov, Vladimir Yusupov, Sergey Dobatkin
Summary: A study was conducted on the effect of rotary swaging (RS) on the microstructure and properties of a Cu-0.5%Cr-0.08%Zr alloy that was pre-extruded and pre-quenched. RS resulted in the formation of an ultrafine-grained (UFG) microstructure. This UFG structure increased the ultimate tensile strength (UTS) to 443 +/- 5 MPa and 597 +/- 9 MPa for the pre-quenched and pre-extruded alloys, respectively. Ductility was reduced after RS.
Article
Materials Science, Multidisciplinary
Bowen Ma, Bailing An, Xue Zhao, Yunchao Li, Jingwen Du, Engang Wang
Summary: Doping Sc can enhance the mechanical properties of Cu-Cr-Zr alloy while maintaining its electrical conductivity. The addition of Sc leads to the formation of a new intermetallic compound with Zr, which segregates at the grain boundary. The solution + rolling + aging process results in improved properties, including the formation of nanoscale precipitates and subgrains. The addition of Sc increases the ultimate tensile strength and hardness of the alloy without significant reduction in electrical conductivity, expanding its application range.
Article
Metallurgy & Metallurgical Engineering
Hai-te Yang, Wen-wei-jiao Wang, Chen Wang, Jian Wang, Jian-hui Zhou, Chang-qing Tong, Jun-feng Chen, Bing-shu Wang
Summary: The effects of aging process on the conductivity, mechanical properties, and microstructure of Cu-1.0Cr-0.1Zr alloy strips were studied. The best comprehensive properties were achieved after aging at 430℃ for 180 min, with the alloy exhibiting an electrical conductivity of 85.86% IACS, a hardness of HV 176.54, and a tensile strength of 552 MPa. The precipitation kinetics and phase growth were analyzed, showing a change in the relationship between the precipitates and matrix.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Review
Materials Science, Multidisciplinary
Kuo Yang, Yihan Wang, Mingxing Guo, Hu Wang, Yongda Mo, Xueguang Dong, Huafen Lou
Summary: Precipitation-strengthened Cu alloys with high strength and conductivity (HSC) have been widely used in the electronic and electrical industries. The primary objective is to enhance the strength of Cu alloys while maintaining high electrical conductivity. This review summarizes the research progress on typical precipitation-strengthened Cu-Ni-Si, Cu-Ti, and Cu-Cr-Zr alloys, as well as the strengthening mechanisms employed. It discusses hetero-deformation induced hardening, the construction and effect of heterogeneous structure, and the trade-off between strength, ductility, and electrical conductivity. Controlling the growth of phases to achieve maximum strength contribution is a key research breakthrough. Furthermore, considerations for large-scale industrialization and production costs are necessary for the development of Cu alloys with HSC.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yihui Jiang, Xingde Zhang, Pengtao Cai, Pengtao Li, Fei Cao, Fan Gao, Shuhua Liang
Summary: A recently discovered Cu-Hf alloy has shown promise in the fabrication of high-strength and high electrical conductivity materials. However, the precipitation behavior and microstructural evolution during thermo-mechanical processing have not been well understood. This study focused on the crystallography, thermodynamics, and kinetics of precipitation during isothermal aging and the interaction between nano-precipitates and nano-twins during liquid nitrogen temperature rolling in Cu-Hf alloys. The results showed that the isothermal aging precipitation of Cu-Hf alloys involved the formation of supersaturated FCC-Cu, coherent Cu5Hf phase, and incoherent Cu51Hf14 phase. The formation of the Cu5Hf phase was attributed to the lower energy and interfacial free energy of coherent nano-precipitates, resulting in shape changes in the nano-precipitates. Molecular dynamics simulations revealed that the pre-existing nano-precipitates significantly improved the twinning ability of the Cu-Hf alloy, leading to the formation of numerous nano-twin bundles during low-temperature rolling. Finally, a new type of Cu-Hf based alloy with excellent combination of high strength, high electrical conductivity, and high heat-resistance was successfully fabricated using routine processes.
Article
Materials Science, Multidisciplinary
Mingwen Wen, Ying Tang, Enkuan Zhang, Lijun Zhang, Xingchuan Xia, Jian Ding
Summary: The phase equilibria and solidified microstructure of the Cu-Cr-La system were studied using experimental techniques and thermodynamic calculations. The results showed good agreement between the calculated phase relationships and the experimental data. The effects of La or Cr additions on the solidification sequences, phase transition temperatures, and phase fractions in Cu-Cr-La alloys were analyzed. This research provides a theoretical basis for the novel design of Cu-Cr-La alloys.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Wei Wang, Zongning Chen, Enyu Guo, Siruo Zhang, Huijun Kang, Tongmin Wang
Summary: This work investigates the microstructures, properties, and precipitation behaviors of cryo-rolled CuNiSi alloys with different Cr additions. It is found that the microstructures of cryo-rolled CuNiSi alloys are mainly composed of nano-sized deformation twins. The addition of chromium facilitates the formation of lamellar structures and hinders the recrystallization and discontinuous precipitation in cryo-rolled CuNiSi alloys.
Article
Materials Science, Multidisciplinary
Chenying Shi, Muzhi Ma, Biaobiao Yang, Yuling Liu, Yushen Huang, Yong Du
Summary: In this study, the effect of Ti content on the microstructure, mechanical, and electrical properties of Cu-Cr-Zr alloys was investigated. The electrical conductivity decreased with increasing Ti content due to electron scattering. The higher hardness/strength was attributed to higher dislocation density and finer FCC-Cr precipitates. Thermodynamic and kinetic calculations showed that increasing Ti content facilitated the nucleation of FCC-Cr but hindered its growth process.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ying Zhang, Xinbing Yun, Ruojing Zhao, Fengtong Zhu, Hongwang Fu
Summary: A novel continuous expanding extrusion process was proposed for manufacturing Cu-Cr-Zr strips. The microstructure and precipitates of the strips were characterized by EBSD and TEM, showing fine and uniform microstructure and dispersed Cr precipitates. The extruded strips exhibited smaller grain size, higher hardness, strength, and electrical conductivity, and maintained a high fracture elongation compared to the as-cast state. Grain boundary strengthening, precipitation strengthening, and dislocation strengthening were found to contribute to the improved properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Rengeng Li, Shaojian Zhang, Huijun Kang, Zongning Chen, Fenfen Yang, Wei Wang, Cunlei Zou, Tingju Li, Tongmin Wang
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Nanoscience & Nanotechnology
Shaojian Zhang, Rengeng Li, Huijun Kang, Zongning Chen, Wei Wang, Cunlei Zou, Tingju Li, Tongmin Wang
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Materials Science, Multidisciplinary
Fenfen Yang, Huijun Kang, Enyu Guo, Rengeng Li, Zongning Chen, Yanhua Zeng, Tongmin Wang
Article
Nanoscience & Nanotechnology
Minqiang Gao, Zongning Chen, Huijun Kang, Rengeng Li, Wei Wang, Cunlei Zou, Tongmin Wang
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2018)
Article
Metallurgy & Metallurgical Engineering
Wei Wang, Zong-Ning Chen, En-Yu Guo, Hui-Jun Kang, Yi Liu, Cun-Lei Zou, Ren-Geng Li, Guo-Mao Yin, Tong-Min Wang
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Wei Wang, Enyu Guo, Zongning Chen, Huijun Kang, Zhongjun Chen, Cunlei Zou, Rengeng Li, Guomao Yin, Tongmin Wang
MATERIALS CHARACTERIZATION
(2018)
Article
Chemistry, Multidisciplinary
Cunlei Zou, Zongning Chen, Enyu Guo, Huijun Kang, Guohua Fan, Wei Wang, Rengeng Li, Siruo Zhang, Tongmin Wang
Article
Chemistry, Physical
Rengeng Li, Enyu Guo, Zongning Chen, Huijun Kang, Wei Wang, Cunlei Zou, Tingju Li, Tongmin Wang
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
Minqiang Gao, Zongning Chen, Huijun Kang, Enyu Guo, Rengeng Li, Ying Fu, Honglan Xie, Tongmin Wang
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2019)
Article
Nanoscience & Nanotechnology
Rengeng Li, Siruo Zhang, Cunlei Zou, Huijun Kang, Tongmin Wang
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Nanoscience & Nanotechnology
Siruo Zhang, Huijun Kang, Rengeng Li, Cunlei Zou, Enyu Guo, Zongning Chen, Tongmin Wang
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Nanoscience & Nanotechnology
Xiong Yang, Zhou Jiang, Huijun Kang, Zongning Chen, Enyu Guo, Daquan Liu, Fenfen Yang, Rengeng Li, Xue Jiang, Tongmin Wang
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Hao Wang, Haoyi Niu, Hao Wu, Rengeng Li, Guohua Fan
Summary: This study investigates the plastic deformation behavior of the ring-rolled GH4169 alloy at the micro level through in situ tensile tests. The results show that the fraction of low-angle grain boundaries increases gradually during tensile deformation, and the misorientation evolution within the grain interior is severely inhomogeneous. Most of the slip system activation coincides with the Schmid law.
Article
Materials Science, Multidisciplinary
Yin Yang, Gui Kuang, Rengeng Li
Summary: Cu-0.4Cr alloys with microalloying of Hf and a modified rolling-aging process showed improved mechanical properties, including high strength, high electrical conductivity, and high ductility. The microstructures of the alloys were characterized by transmission electron microscopy and X-ray line broadening analysis. The Cu-Cr-Hf alloy with reduced Hf content exhibited good combination of strength, electrical conductivity, and ductility.
Article
Engineering, Multidisciplinary
Yichen Lu, Zongning Chen, Enyu Guo, Xiangqing Kong, Huijun Kang, Yanjin Xu, Rengeng Li, Guohua Fan, Tongmin Wang
Summary: This study characterized the real 3D model of the feather shaft composed of medulla and cortex using X-ray computer tomography and conducted compression and tensile tests to evaluate mechanical performance. The presence of medulla enhances shaft stability in axial compression, and the cortex shows anisotropic tensile properties along the shaft axis.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
