Zr对Mo-Zr合金力学性能与显微组织的影响  

Effect of Zr on property and microstructure of Mo-Zr alloy

作　　者：钱昭[1] 范景莲[1] 成会朝[1] 田家敏[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第8期3146-3150,共5页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(50925416)

摘　　要：采用粉末冶金方法制备Mo-Zr合金,研究Zr对Mo-Zr合金相对密度、力学性能及其显微组织的影响。结果表明:合金经1 920℃烧结后接近全致密,相比纯Mo其室温抗拉强度明显提高,Zr添加量为3.0%(质量分数)时,合金抗拉强度最高,达603 MPa,较纯Mo提高了72.4%。显微组织分析发现,少量Zr原子固溶进入Mo基体中产生显著固溶强化作用,大部分Zr则与坯体中的氧结合,一方面净化了晶界氧,使晶界强度提高;另一方面形成二次相粒子弥散分布于晶界和晶粒内部,并阻碍合金烧结时的晶粒长大,有利于提高合金性能,但过多的氧化物粒子在晶界的富集将对合金强度产生不利影响。Mo-Zr alloys were fabricated via powder metallurgy method. The effects of Zr on relative density microstructure and property of Mo-Zr alloy were studied. The results indicate that the relative density and tensile strength at room temperature of Mo-Zr alloy are effectively enhanced after adding Zr. The tensile strength achieves the highest value 603 MPa when the content of Zr is 3.0%（mass fraction）, which is 72.4% higher than pure Mo. The microstructure analysis reveals that a part of Zr solves into the Mo matrix, which enhances the tensile strength of the alloys, while the other paff of Zr forms oxide second phase particles. However, over-dose oxide particles would generate negative influence on the property of the alloy.

关 键 词：Mo-Zr合金 固溶强化 二次相粒子 

分 类 号：TG146.4[一般工业技术—材料科学与工程]