Microstructure and fracture characterization of TiAl matriz by addition of fluoride solid lubricants

摘要：

The fracture characterization of Ti-48Al-2Nb-2Cr composites (TANC) with addition of different weight contents of fluoride solid lubricants (LiF,NaF,CaF2 and 38％CaF2-62％BaF2 eutectic solid lubricant (BC)) were evaluated in the paper.The fracture toughness of composites with different content of fluoride solid lubricants was discussed.The TANC composites with 0-5 wt.％ solid lubricant exhibited higher fracture toughness.It was shown that additions of all fluoride solid lubricants to TANC matrix resulted in decrease in fracture toughness expect for additions of 5％ of that.By adding 5 wt.％ BC the fracture toughness of the TANC composites exhibited a maximum of 12.2MPa·m1/2 and by addition of 5％CaF2,11.4Mpa·m1/2;5％LiF,10.8MPa·m1/2 while 5％NaF,ll.lMPa·m1/2.However,with further increasing of fluoride solid lubricants contents it showed a downward trend.By adding 20 wt.％ BC the fracture toughness of the TANC composites exhibited a maximum value of 8.6 MPa ?m1/2;by addition of 20％CaF2,8.1MPa?m1/2;20％LiF,8.3MPa?m1/2 while 5％NaF,7.9MPa·m1/2.

关键词： Ti-48Al-2Nb-2Cr Solid lubricants Microstructure Mechanical properties Fracture

作者: Liying Yang Shouren Wang Min Wang Yanjun Wang Fang Zhao

作者单位: School of Mechanical Engineering,University of Jinan,Jinan 250022,China School of Material Science and Engineering,Shandong University,Jinan 250022,China

会议类型: 国际会议

会议名称: 国际断裂力学2009年会

会议地点: 成都

会议语种:英文

页码: 121-125

在线出版日期: 2009-10-16（万方平台首次上网日期，不代表论文的发表时间）