TY - JOUR
T1 - Formation of Fine B2/β + O Structure and Enhancement of Hardness in the Aged Ti2AlNb-Based Alloys Prepared by Spark Plasma Sintering
AU - Li, Mengchen
AU - Cai, Qi
AU - Liu, Yongchang
AU - Ma, Zongqing
AU - Wang, Zumin
AU - Huang, Yuan
AU - Li, Huijun
N1 - Publisher Copyright:
© 2017, The Minerals, Metals & Materials Society and ASM International.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - Ti2AlNb-based alloys synthesized at 1223 K (950 °C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700 °C, 750 °C, 800 °C, and 850 °C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanstätten B2/β + O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanstätten B2/β + O laths, with locally finely dispersed β precipitates, were obtained in the alloy aged at 1073 K (800 °C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations Oequiaxed→Oprimary + B2/βprimary, Oprimary→Osecondary + B2/βsecondary, and B2/βprimary→O.
AB - Ti2AlNb-based alloys synthesized at 1223 K (950 °C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700 °C, 750 °C, 800 °C, and 850 °C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanstätten B2/β + O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanstätten B2/β + O laths, with locally finely dispersed β precipitates, were obtained in the alloy aged at 1073 K (800 °C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations Oequiaxed→Oprimary + B2/βprimary, Oprimary→Osecondary + B2/βsecondary, and B2/βprimary→O.
UR - http://www.scopus.com/inward/record.url?scp=85021806709&partnerID=8YFLogxK
U2 - 10.1007/s11661-017-4193-8
DO - 10.1007/s11661-017-4193-8
M3 - Article
AN - SCOPUS:85021806709
SN - 1073-5623
VL - 48
SP - 4365
EP - 4371
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 9
ER -