TY - JOUR
T1 - Tailoring the Microstructure of a β-Solidifying TiAl Alloy by Controlled Post-solidification Isothermal Holding and Cooling
AU - Yang, Jieren
AU - Wang, Xuyang
AU - Cao, Bei
AU - Wu, Yulun
AU - Zhang, Keren
AU - Hu, Rui
N1 - Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society and ASM International.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - In this study, the microstructure of a β-solidifying TiAl alloy was modified by means of temperature-controlled cooling. The microstructural evolution of the Ti-44.5Al-4Nb-2Cr-0.1B alloy in different cooling processes was investigated. The results showed firstly that both the solidification-segregation (S-segregation) and β-segregation were reduced considerably by raising the temperature or extending the time in the single β-phase region. Then samples were cooled through the β + α phase region at the cooling rates of 2, 50, and 650 K/min. The B2-phase and some large γ-phases exist in lamellar microstructure, which might be more evident at a higher cooling rate. Further, the Burgers relationships of {0001}α2//{110}β(B2) and {112 ¯ 0}α2//{111}β(B2) were identified in the fast cooling microstructure, and the non-Burgers equiaxed α-grains grew easily at a slow cooling rate.
AB - In this study, the microstructure of a β-solidifying TiAl alloy was modified by means of temperature-controlled cooling. The microstructural evolution of the Ti-44.5Al-4Nb-2Cr-0.1B alloy in different cooling processes was investigated. The results showed firstly that both the solidification-segregation (S-segregation) and β-segregation were reduced considerably by raising the temperature or extending the time in the single β-phase region. Then samples were cooled through the β + α phase region at the cooling rates of 2, 50, and 650 K/min. The B2-phase and some large γ-phases exist in lamellar microstructure, which might be more evident at a higher cooling rate. Further, the Burgers relationships of {0001}α2//{110}β(B2) and {112 ¯ 0}α2//{111}β(B2) were identified in the fast cooling microstructure, and the non-Burgers equiaxed α-grains grew easily at a slow cooling rate.
UR - https://www.scopus.com/pages/publications/85023191584
U2 - 10.1007/s11661-017-4209-4
DO - 10.1007/s11661-017-4209-4
M3 - 文章
AN - SCOPUS:85023191584
SN - 1073-5623
VL - 48
SP - 5095
EP - 5105
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 10
ER -