Hot deformation mechanism and microstructure evolution of TC11 titanium alloy in β field

被引：53

作者：

Chen Hui-qin ^{[1
,2
]}

Cao Chun-xiao ^{[1
]}

Guo Ling ^{[1
]}

Lin Hai ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

[2] Taiyuan Univ Sci & Technol, Sch Mat Sci & Engn, Taiyuan 030024, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2008年 / 18卷 / 05期

关键词：

TC11 titanium alloy; hot deformation; microstructure evolution;

D O I：

10.1016/S1003-6326(08)60175-2

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Hot deformation behaviors of TC11 alloy with beta-annealed lamellar structure and forged equiaxed structure were investigated in the beta field in the temperature range of 1 090-1 030 degrees C and strain rate of 0.001-0.1 s(-1) by means of isothermal compression tests. Hot deformation characteristics and microstructure evolutions of the two starting structures were analyzed. And hot processing power dissipation efficiency maps were established. EBSD technique was used for testing grain boundary characteristic of deformation structures. The results indicate that hot deformation mechanism of TC11 alloy in beta field is dynamic recovery accompanied by geometric dynamic recrystallization at large strains, or discontinuous dynamic recrystallization based on the starting structure states and deformation parameters. Accordingly, there are two different grain refining patterns. One is characteristic of new fine grains in the interior of elongated prior beta grains that have serrated grain boundaries; and the other is that of new fine grains along elongated prior beta grain boundaries.

引用

页码：1021 / 1027

页数：7

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