Hot Deformation Mechanisms of an As-Extruded TiAl Alloy with Large Amount of Remnant Lamellae

2017 ◽  
Vol 26 (7) ◽  
pp. 3151-3159 ◽  
Author(s):  
Hongwu Liu ◽  
Rong Rong ◽  
Fan Gao ◽  
Yanguo Liu ◽  
Zhenxi Li ◽  
...  
Keyword(s):  
Hot Deformation ◽  
Tial Alloy ◽  
Deformation Mechanisms

Hot Deformation Mechanisms of Ti22Al25Nb Orthorhombic Alloy

2019 ◽  
Vol 28 (2) ◽  
pp. 973-980 ◽  
Author(s):  
Jingli Zhang ◽  
Jingping Wu ◽  
Yuanyuan Luo ◽  
Xiaonan Mao ◽  
Dizi Guo ◽  
...  
Keyword(s):  
Hot Deformation ◽  
Deformation Mechanisms ◽  
Orthorhombic Alloy

Hot deformation behavior and microstructural evolution of powder metallurgical TiAl alloy

Rare Metals ◽  
2016 ◽  
Vol 36 (4) ◽  
pp. 236-241 ◽  
Author(s):  
Na Liu ◽  
Zhou Li ◽  
Wen-Yong Xu ◽  
Yue Wang ◽  
Guo-Qing Zhang ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Tial Alloy ◽  
Hot Deformation Behavior

scholarly journals Quantitative analysis of microstructures produced by creep of Ti–48Al–2Cr–2Nb–1B: Thermal and athermal mechanisms

1998 ◽  
Vol 13 (3) ◽  
pp. 625-639 ◽  
Author(s):  
M. A. Morris ◽  
M. Leboeuf
Keyword(s):  
Tial Alloy ◽  
Mechanical Twinning ◽  
Deformation Mechanisms ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Pipe Diffusion ◽  
Thermally Activated ◽  
Fine Grain ◽  
Hardening Process ◽  
Secondary Stage

A γ-based TiAl alloy with equiaxed microstructure and fine grain size has been studied to analyze the deformation mechanisms responsible for the creep behavior. The microstructures produced by creep and high temperature deformation have been examined by TEM to obtain information about the different aspects characterizing the primary and secondary stages of creep. Mechanical twinning has been confirmed to occur in a fraction of the grains that never exceeds 50% while 1/2 ‹110› dislocations are active within all the γ grains. The twins are only responsible for a small amount of strain, but they lead to a subdivision of the microstructure and determine (directly or indirectly) the hardening process observed during the primary stage of creep. We have proposed that during the secondary stage the creep rate is determined by the unblocking of pinned dislocations by processes such as a pipe diffusion or cross slip that allow thermally activated glide of 1/2‹110› dislocations on (001) planes.

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