Evaluation of nanoscaled precipitates in a Cu-Ni-Si-Cr alloy during aging

被引:111
作者
Cheng, J. Y. [1 ]
Tang, B. B. [1 ,2 ]
Yu, F. X. [1 ]
Shen, B. [1 ]
机构
[1] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Peoples R China
[2] Nanchang Univ, Inst Adv Study, Nanchang 330031, Peoples R China
基金
中国国家自然科学基金;
关键词
Copper alloys; Precipitation; Morphology; Orientation relationship; Aging; MECHANICAL-PROPERTIES; MICROSTRUCTURE; COPPER; STRENGTH; BEHAVIOR;
D O I
10.1016/j.jallcom.2014.06.089
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The concurrent existence of three kinds of nano-scaled precipitates, ordered face-centered cubic beta-Ni3Si, orthorhombic delta-Ni2Si and ordered face-centered cubic (Ni, Cr, Si)-rich phase, was found in a Cu-Ni-Si-Cr alloy during aging at 500 degrees C by high resolution transmission electron microscopy and scanning transmission electron microscopy. It is the first time to report the precipitation of ordered fcc (Ni, Cr, Si)-rich phase in Cu-Ni-Si system alloys during aging. The morphology of beta-Ni3Si precipitates changed from spheroid to ellipsoid with prolonged aging time. The delta-Ni2Si precipitates had its six variants lying on the {01 1}(Cu) habit planes and maintained disc-like during the whole aging process. The orientation relationships with copper matrix were as follows: (001)(Cu)//(001)(delta), [110](Cu)//[010](delta) for delta-Ni2Si, and cube-on-cube ones for beta-Ni3Si and (Ni, Cr, Si)-rich phase. The precipitation of (Ni, Cr, Si)-rich phase is responsible for high strength at overaging conditions as 500 degrees C (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:189 / 195
页数:7
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