Densification Behavior of Ti-5Al-2. 5Sn ELI Prealloyed Powders Under Hot Isostatic Pressing

摘要：

The densification behavior of Ti-5Al-2. 5Sn ELI prealloyed powders in low carbon steel containers was investigated by interrupting experiments at various stages of hot isostatic pressing (HIP) cycle. The cross-section and tensile fracture of the porous compact body were observed by optical microscope (OM) and scanning electron microscope respectively, while the density was measured by an Archimedes principlebased method. Four stages with different mechanisms dominant in powder densification were identified as follows: slow removal of container shielding effect below 640℃,quick particle flow from 640℃ to 740℃,heavy plastic deformation from 740℃ to 840℃ ,and slow removal of isolated pores from 840℃ to 940℃. Compacts of powders with a broader particle size distribution exhibit a higher densification rate at both the second and third stages. The result can be explained by assuming a sufficient number of small particles sliding around large ones,leading to close packing and preferential and heavy deformation of the small particles, thus accelerating the densification process

关键词： Ti-5Al-2.5Sn ELI pre-alloyed powders hot isostatic pressing shielding effect

作者: Jun Wu Lei Xu Hua Li Jiafeng Lei Yuyin Liu Rui Yang

作者单位: Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

会议类型: 国际会议

会议名称: The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)

会议地点: 北京

会议语种:英文

页码: 754-757

在线出版日期: 2011-06-19（万方平台首次上网日期，不代表论文的发表时间）