Surface nanocrystallization of Cu-Cr alloy by a high power density continuous laser beam

被引：4
作者：
Zhang, Litian [1 ,2 ]
Yu, Gang [1 ,3 ]
He, Xiuli [1 ,2 ]
Li, Shaoxia [1 ]
Tian, Chongxin [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China
来源：
MATERIALS LETTERS | 2019年 / 237卷
关键词：
Laser surface melting; Cu-Cr alloy; Solidification; Microstructure; Surface nanocrystallization; STAINLESS-STEEL; MICROSTRUCTURE; EVOLUTION;
D O I：
10.1016/j.matlet.2018.11.108
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A nanostructured surface layer of similar to 300 mu m thickness was fabricated on Cu-30Cr (wt%) hypereutectic alloy by a continuous laser beam with high power density (1.08 x 10(7) W/cm(2)). The average grain size of Cr-rich particles was refined to similar to 40 nm, and the solid solubility limit of Cr in Cu was extended to 1.96 at. %. Experimental results show that the dispersion of nano-sized Cr-rich spheroids in Cu-rich matrix was attributed to the Brownian motion of Cr-rich spheroids, and the high cooling rate (5.75 x 10(6) K/s) during liquid phase separation which inhibits the collisions between Cr-rich spheroids. (C) 2018 Published by Elsevier B.V.
引用
收藏
页码：216 / 219
页数：4
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