摘要
对热等静压后的Ti 46.5Al 2Cr 1.5Nb 1V合金进行了热处理,获得了一系列含有不同片层晶粒体积分数的双态组织。室温拉伸实验结果表明,片层晶粒体积分数对双态组织TiAl合金的性能影响很大。在应变速率一定的情况下,片层晶粒体积分数的增加会导致双态组织TiAl合金屈服强度的增加以及室温塑性的降低。在近γ组织中,室温塑性随着应变速率的增加而增加,原因主要是在应变速率较高时,有较多的孪晶系开动。
A special heat treatment process was employed to produce a series of fine duplex microstructures with different lamellar grain volume fractions. Tensile tests were carried out at ambient temperature. It is found that the mechanical properties of the duplex alloys closely depend on their microstructures. At the same strain rate, with the increase of lamellar grains volume fraction, the yield strength of alloys increases and their plastic elongation decreases. In the alloys with near γ microstructures, ambient temperature ductility increases with the increase of strain rate. It mainly comes from the activation of more twin deformation systems.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第2期448-453,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(59895150)
