最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

The objective of this study is to find a suitable heat treatment for below T_α extruded TiAl alloy with balanced tensile property. The Ti-47Al-2Cr-2Nb-0.15B(at%) alloy rod was fabricated by near isothermal canned hot extrusion at 1300℃ with a 3:1 extrusion ratio. With less refined microstructure including small equiaxed grain belt, remnant lamellar and coarse γ grains in the band shape, the extrusion rod was heat-treated at 900℃, 1150℃ and 1310℃ respectively. The tensile results at room temperature and elevated temperature show that the samples by heat-treatment at 900 ℃ have the superior tensile properties with 3.3% elongation at room temperature. For those samples heat treated at 1150 ℃ with microstructure of near γ and heat treated at 1310℃ with microstructure of near lamellar, their yield strength and ultimate tensile strength are lower than those heat treated at 900℃. The remnant lamellar limits the γ grain growth freely and keeps the extrusion morphology at 900 ℃.