Influence of Extrusion Temperature on Microstructure of Ti-47Al-2Cr-2Nb-0.15B
Influences of extrusion temperature on the deformed and subsequently thermomechanically treated lamellar (TMTL) microstructures of Ti-47Al-2Cr-2Nb-0.15B alloy as observed on the transverse section were investigated. Canned ingots were axisymmetricallyextruded through a flat die to an extrusion ratio of 8 ! 1. The extruded rods on the transverse section consisted of fine duplex microstructure at the edge and fully lamellar (FL) at the center. However, the FL microstructure at the center changed with increasing extrusion temperature: the rods contained remnant lamellae and partially recrystallized FL grains after extrusion at 1250℃ and 1280℃ ,and consisted of completely recrystallized grains after extrusion at 1300℃, with the size and volume fraction of the recrystallized FL grains increasing with the increase of extrusion temperature. The heterogeneity of deformed and TMTL microstructures is believed to be caused by nonuniform deformation and temperature distribution due to deformation heating and die chilling.
γ-titanium aluminide ( TiAl) extrusion temperature microstructure thermomechanical treatment
Renci Liu Dong Liu Yuyou Cui Rui Yang
Institute of Metal Research, Chinese Academy of Sciences, Shenyang ,110016 , China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1553-1557
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）