全层状TiAl合金室温拉伸性能的影响因素

Factors Affecting the Room Temperature Tensile Properties of TiAl Alloys with Fully Lamellar Microstructures

摘要:

研究了显微组织和应变速率对全层状Ti-47Al-2Cr(at%)合金室温拉伸性能的影响，结果表明，全层状TiAl基合金的室温拉伸强度和室温延伸率随晶团尺寸和层片间距的减小而提高；其室温拉伸强度随应变速率的加快而提高；而应变速率对其室温延伸率的影响与显微组织相关，低延性全层状TiAl基合金的室温延伸率对应变速率不敏感，而高延性全层状TiAl基合金的室温延伸率对应变速率敏感，并随应变速率的加快而提高。

Abstract:

The effects of the microstructure and the strain rate on the room temperature tensile properties of Ti 47Al 2Cr(at%) with fully lamellar microstructures were investigated. It is shown that the room temperature tensile strength and ductility increase with the decrease of colony size and lamellar spacing. The room temperature tensile strength increases with the increase of strain rate. The room temperature ductility of low ductility alloy is not sensitive to strain rate, but the ductility of high ductility alloy is sensitive and increases with the increase of the strain rate.