稀土掺杂对钼条及钼丝组织和性能的影响  

Influence of Rare Earth Doping on Microstructure and Properties of Molybdenum Bars and Wires

作　　者：李光宗[1] 魏修宇[1,2] 

机构地区：[1]株洲硬质合金集团有限公司,湖南株洲412000 [2]硬质合金国家重点实验室,湖南株洲412000

出　　处：《硬质合金》2016年第1期14-18,共5页Cemented Carbides

基　　金：湖南省自然科学基金株洲市联合基金重点项目(13JJ8024)

摘　　要：本文采用液-液掺杂的方式,将单一稀土或复合稀土的硝酸盐掺入钼酸铵溶液中得到掺杂钼酸铵,然后通过粉末冶金的方法制得钼合金坯条,再经过旋锻、拉拔得到掺杂钼合金丝材样品。采用拉伸试验机、金相显微镜等测试手段研究了镧、钇和镧钇复合稀土掺杂对钼坯条及钼丝材性能的影响规律。研究结果表明,稀土掺杂可显著提高钼合金丝的高温强度和弯折性能,相比于单一稀土元素掺杂,镧钇复合掺杂可获得更好的高温力学性能。镧钇复合掺杂钼合金再结晶组织呈现等轴晶和锁状燕尾搭接晶的混合组织。In this paper, single or composite rare earth element lanthanum and yttrium were doped into ammonium molybdate by liquid-liquid doping method. Molybdenum alloy bars were prepared from the doped ammonium molybdates by powder metallurgy. Samples of doped molybdenum alloy wire were obtained by rotating forging and drawing. The influences of single and composite lanthanum and yttrium addition on microstructure and properties of molybdenum bars and molybdenum wires were studied by means of tensile testing machine and metallographic microscope. The results show that rare earth doping can significantly improve high temperature strength and bending properties of molybdenum alloy wires.Compared with single rare earth element doping, composite doped molybdenum wire by lanthanum and yttrium can obtain better high temperature mechanical properties. The microstructure of composite doped molybdenum wire is the mixture of equiaxed crystal and dovetail joint structure.

关 键 词：钼条 钼丝材 氧化镧 氧化钇 

分 类 号：TG146.412[一般工业技术—材料科学与工程]