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

页码：216 / 219

页数：4

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