细晶钼铜合金地制备.pdf

第 18 卷第 6 期 中国有色金属学报 2008 年 6 月 Vol.18 No.6 The Chinese Journal of Nonferrous Metals Jun. 2008 文章编号：1004-0609(2008)06-1039-06 细晶钼铜合金的制备 陈玉柏，范景莲，刘 涛，成会朝，田家敏 (中南大学 粉末冶金国家重点实验室，长沙 410083) 摘 要：采用溶胶-喷雾干燥-煅烧-氢还原方法制取晶粒尺寸为 17~50 nm 的超细Mo-30Cu 复合粉末，研究烧结温 度、时间和粉末中的氧含量对烧结致密化的影响，检测合金的拉伸力学性能，分析合金的拉伸断口形貌特征。结 ℃烧 果表明：还原温度对粉末形貌有很大的影响；在 1 050~1 200 ℃烧结即可实现材料的快速致密化，在 1 050 结后保温 60 min 时，合金的相对密度可达 99%以上，并且晶粒细小，显微组织分布均匀；合金的最大抗拉强度 可达 755 MPa，伸长率为 6.41%。 关键词：Mo-Cu 合金；超细粉末；力学性能；断裂机制 中图分类号： 文献标识码： TG 146.4 A Fabrication of fine-grained Mo-Cu alloy CHEN Yu-bo, FAN Jing-lian, LIU Tao, CHENG Hui-chao, TIAN Jia-min (State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract: Ultra-fine Mo-30Cu composite powders with grain size of 17−50 nm were fabricated by sol-spray drying, calcination and subsequent hydrogen reduction process. The results show that the influence of sintering temperature, time and the oxygen content in the powder on sintering densification were investigated. Meanwhile the tensile mechanical property of alloys was examined, and the tensile fracture surface features of the alloys were analysed. The results show that the reduction temperature has a great impact on powder morphology; the rapid densificatio