快速凝固Cu_(71)Cr_(29)合金的显微组织及性能  

Microstructure and Properties of Rapid Solidified Cu_(71)Cr_(29) Alloy

作　　者：周志明[1] 唐丽文[1] 陈元芳[1] 王亚平[2] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400050 [2]西安交通大学理学院,陕西西安710049

出　　处：《热加工工艺》2009年第23期33-35,共3页Hot Working Technology

基　　金：重庆市教育委员会科学技术研究项目(KJ080611);新世纪优秀人才支持计划资助项目(NCET-07-0679);重庆工学院基金项目(09-60-16);重庆市自然科学基金项目(2008BA3014和2007BB4413)

摘　　要：研究了氩气保护熔炼和单辊旋铸Cu71Cr29合金的显微组织和性能。结果表明,氩气保护熔炼Cu71Cr29合金的显微组织主要以初生的富Cr枝晶形式存在于Cu基体中,而单辊旋铸Cu71Cr29合金的显微组织呈现出球状富Cr相,且富Cr球的大小随着条带厚度的变化而变化,靠近自由面的富Cr球直径比接触面要大,分析表明合金快速凝固过程中发生了亚稳态的液相分离。与氩气保护熔炼Cu71Cr29合金相比,单辊旋铸Cu71Cr29合金的显微硬度增加了100%,主要是由于固溶度增加和晶粒细小的缘故。The microstructure and properties of Cu71Cr29 alloys processed by argon protecting melting and melt spirting were investigated. The results show that the microstructure consisting of fine dendrites of primary Cr-rich phase in a Cu-rich matrix appears in argon protecting melted Cu71Cr29 alloys. However, Cr-rich spheroids appear in melt-spun Cu71Cr29 alloys. The morphology and size of the Cr-rich phase vary with the thickness of ribbons. The Cr-rich spheroids show a wide distribution of size, and have a larger mean size on the free surface than on the contact surface. The results are explained by assuming metastable liquid phase separation during rapid solidification. Contrasted to the argon protecting melted CU71Cr29 alloys, the microhardness of melt-spun Cu71Cr29 ribbons is increased by 100%, which result from the grain refinement and solid solution increase.

关 键 词：Cu71Cr29合金 快速凝固 液相分离 显微组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]