合金元素Nb对电弧熔炼Co-Al-W合金显微组织的影响  

Effect of alloy element Nb on microstructure of arc melted Co-Al-W alloy

作　　者：李立峰[1] 徐仰涛[2] 罗震[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《金属热处理》2012年第12期40-42,共3页Heat Treatment of Metals

摘　　要：利用光学显微镜、XRD和扫描电子显微镜等对电弧熔炼Co-8.8Al-9.8W及Co-8.8Al-9.8W-2Nb合金组织进行观察与分析,研究元素Nb对Co-Al-W合金显微组织的影响。结果表明,Co-Al-W合金的相组成主要为γ相+沉淀析出的γ'-Co3(Al,W)相。Nb的加入有利于γ'相的存在,显著提高Co-Al-W合金的硬度,且细化晶粒。Microstructure of arc melted Co-8.8Al-9.8W and Co-8.8A1-9.8W-2Nb alloy was observed and analyzed by optical microscopy, XRD and scanning electron microscope. Effect of element Nb on microstrueture of Co-Al-W alloy was investigated. The results show that the Co-Al-W alloy is composed mainly of γ phase and precipitated γ′ -C% （A1,W） phase. The adding of Nb is beneficial for the existence of γ′ phase, significantly improve hardness of Co-Al-W alloy and refine the grain.

关 键 词：CO-AL-W合金 合金元素Nb 显微组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]