Correlation between microstructures and mechanical properties of cryorolled CuNiSi alloys with Cr and Zr alloying

doi:10.1016/j.matchar.2018.08.003

	Correlation between microstructures and mechanical properties of cryorolled CuNiSi alloys with Cr and Zr alloying
	Li, Rengeng; Chen ZJ(陈中军); Wang, Tongmin; Yin, Guomao; Zou, Cunlei; Chen, Zhongjun; Kang, Huijun; Chen, Zongning; Guo, Enyu; Wang, Wei
刊名	MATERIALS CHARACTERIZATION
	2018
卷号	144 页码:532-546
关键词	CuNiSi alloy Cryorolling Precipitation X-ray diffraction Microstructures
ISSN号	1044-5803
DOI	10.1016/j.matchar.2018.08.003
文献子类	Article
英文摘要	Due to their high strength and high electrical conductivity, CuNiSi system alloys are widely used as lead frames and connectors. In this work, CuNiSi alloys alloyed with Cr and Zr were rolled at liquid nitrogen temperature and subjected to various aging treatments. High -angle annular dark field scanning transmission electron microscopy (HAADF-STEM) analysis showed that in addition to forming Cr3Si and Ni2SiZr particles, elemental Cr and Zr distributed evenly in the matrix. Ni and Si segregated at the interface between the particles and matrix to form Ni2Si precipitates. During the aging process, Cr alloying increased the hardness while slightly reducing the electrical conductivity of the alloy. This was ascribed to the refined precipitates and hindered precipitation kinetics. Zr alloying promoted both the precipitate growth and the precipitation kinetics of the CuNiSi alloys, while decreasing their hardness and enhancing their electrical conductivity. According to the results of the synchrotron X-ray diffraction (XRD) analysis, Cr alloying increased the dislocation density of CuNiSi alloys and suppressed the annihilation of dislocations during aging. This promoted strength through work hardening. Compared to CuNiSi alloys aged at 723 K for 2 h, the ultimate tensile strength of the alloys obtained after Cr alloying using a two-step rolling aging process was increased by 154 MPa and their electrical conductivity was increased by 4.8% International Annealed Copper Standard (IACS).
电子版国际标准刊号	1873-4189
WOS关键词	NI-SI ALLOYS ; SEVERE PLASTIC-DEFORMATION ; HIGH ELECTRICAL-CONDUCTIVITY ; GRAIN-BOUNDARY MOTION ; LINE-PROFILE ANALYSIS ; CU-CR ; HIGH-STRENGTH ; DISLOCATION CONTRAST ; PRECIPITATION ; COPPER
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:000447477300055
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286609]
专题	高能物理研究所_多学科研究中心高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Li, Rengeng,Chen ZJ,Wang, Tongmin,et al. Correlation between microstructures and mechanical properties of cryorolled CuNiSi alloys with Cr and Zr alloying[J]. MATERIALS CHARACTERIZATION,2018,144:532-546.
APA	Li, Rengeng.,陈中军.,Wang, Tongmin.,Yin, Guomao.,Zou, Cunlei.,...&Wang, Wei.(2018).Correlation between microstructures and mechanical properties of cryorolled CuNiSi alloys with Cr and Zr alloying.MATERIALS CHARACTERIZATION,144,532-546.
MLA	Li, Rengeng,et al."Correlation between microstructures and mechanical properties of cryorolled CuNiSi alloys with Cr and Zr alloying".MATERIALS CHARACTERIZATION 144(2018):532-546.