Mo-Nb合金单晶的高温力学性能  

High Temperature Mechanical Properties of Mo-Nb Alloy Single Crystals

作　　者：胡忠武[1] 李中奎[1] 殷涛[1] 郭林江[1] 张清[1] 郑剑平[2] 

机构地区：[1]西北有色金属研究院新材料研究所,陕西西安710016 [2]中国原子能科学研究院,北京102413

出　　处：《稀有金属》2010年第1期48-52,共5页Chinese Journal of Rare Metals

基　　金：国家自然基金项目(50871091)资助

摘　　要：研究了晶向为<111>Mo-Nb合金单晶的高温力学性能。实验结果表明,随着少量溶质原子Nb的加入,Mo-Nb合金单晶的高温强度获得了明显的提高。在1873K和Nb含量在0～6%范围内时(文中合金元素Nb含量均为质量百分比,下同),Nb含量每增大1%,材料的高温屈服强度就增加约16～25MPa,当Nb含量在0～3%范围内时,随着Nb含量的增加,塑性急剧下降,而在3%～6%范围内时其下降幅度趋于平缓;同时,随着Nb浓度的增大,更多的Nb溶质原子增大了原子间扩散阻力,使材料高温稳态蠕变率减小,大大提高了材料的高温抗蠕变性能;在1773K/10MPa时Mo-Nb合金单晶的稳态蠕变率较纯Mo单晶的降低了3～4个数量级,分析认为其蠕变机制为扩散蠕变。The high temperature mechanical properties of Mo-Nb alloy single crystals with <111> orientation were studied. The experimental results showed that significant increase in high temperature mechanical properties could be achieved with small amount addition of substitutional alloying element Nb. The yield strength at 1873 K increased approximately 16~25 MPa with Nb increasing 1% in the range of 0~6% Nb. The elongation of materials drastically decreased from 0 to 3%,but it appreciably reduced when the co...

关 键 词：Mo-Nb合金单晶 固溶强化 高温强度 高温稳态蠕变速率 

分 类 号：TG146.4[一般工业技术—材料科学与工程]