粉末冶金Ti-22Al-25Nb合金的真空热压烧结工艺  

Vacuum Hot-pressing Sintering Processes for a Powder Metallurgy Ti-22Al-25Nb Alloy

作　　者：杨越[1] 贾建波[1] 刘文超[1] 徐岩[1] 陈晨[1] 刘鑫刚[1] 骆俊廷[1,2] YANG Yue;JIA Jianbo;LIU Wenchao;XU Yan;CHEN Chen;LIU Xingang;LUO Junting(Education Ministry Key Laboratory of Advanced Forging ＆ Stamping Technology and Science, Yanshan University, Qinhuangdao, Hebei, 066004;State Key Laboratry of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei, 066004)

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,秦皇岛066004

出　　处：《中国机械工程》2018年第10期1227-1233,1239,共8页China Mechanical Engineering

基　　金：河北省自然科学基金资助项目(E2016203157);秦皇岛市科学与技术基金资助项目(E201602A008);燕山大学博士基金资助项目(B936)

摘　　要：以气雾化法获得的Ti-22Al-25Nb(at.%)预合金粉末为初始原料,采用真空热压烧结工艺方法制备组织致密、成分均匀的粉末冶金Ti-22Al-25Nb合金。应用有限元软件MSC.Marc对Ti-22Al-25Nb(at.%)预合金粉末的致密化过程进行数值模拟,分析了温度和压力对Ti-22Al-25Nb粉末致密化过程的影响,揭示了粉末相对密度随温度和压力变化的规律,得到优化的烧结工艺参数,以指导热压实验烧结。通过热压烧结实验制备了组织致密、成分均匀的Ti-22Al-25Nb合金,发现1 050℃/35 MPa/1 h条件下烧结的合金具有最优的室温和650℃高温综合力学性能。A powder metallurgy（P/M） Ti-22 Al-25 Nb alloy with dense microstructure and uniform composition was prepared by using vacuum hot-pressing sintering method. The original powders were determined to be Ti-22 Al-25 Nb（at.%）pre-alloyed powders which obtained by aerosol method. The densification process of the Ti-22 Al-25 Nb（at.%）pre-alloyed powders was simulated numerically by using the finite element software MSC. Marc. The effects of temperature and pressure on the densification processes of the Ti-22 Al-25 Nb powders were analyzed. The evolution of relative densities varying with temperature and pressure was revealed herein. In addition,the optimized sintering parameters were obtained to guild the following hot-pressing sintering experiments. The dense P/M Ti-22 Al-25 Nb alloy with uniform composition was fabricated by hot-pressing sintering experiments. It may be observed that the alloy which is sintered at 1 050 ℃/35 MPa/1 h demonstrates the optimal mechanics properties at room temperature and 650 ℃,respectively.

关 键 词：Ti-22Al-25Nb预合金粉末 真空热压烧结 致密化过程 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]