TY - JOUR
T1 - Dual structure O + B2 for enhancement of hardness in furnace-cooled Ti2AlNb-based alloys by powder metallurgy
AU - Li, Mengchen
AU - Cai, Qi
AU - Liu, Yongchang
AU - Ma, Zongqing
AU - Wang, Zumin
AU - Huang, Yuan
AU - Yu, Jianxin
N1 - Publisher Copyright:
© 2017 The Society of Powder Technology Japan
PY - 2017/7
Y1 - 2017/7
N2 - Powder metallurgic Ti2AlNb alloys were sintered at 900 °C, 990 °C, 1060 °C, and 1100 °C (i.e. in the O + B2, α2 + B2 + O, α2 + B2, and B2 phase region, respectively) for 12 h, followed by water quenching and furnace cooling. Quenching was employed to reserve the high-temperature phase and microstructure, and furnace cooling aimed to regulate the room-temperature microstructure for the enhancement of hardness. Widmanstatten B2 + O structure, which contributes to the properties, was induced from B2 crystals by sintering, unless the alloy was treated in the α2 + B2 phase region. With the elevation of the sintering temperature, the content of α2 phase became lower in the furnace-cooled alloys, and the hardness was improved accordingly. The highest hardness performance, 389 ± 23 HV, was obtained in the alloy solution treated in the single B2 region, and the alloy was comprised of complete O + B2 Widmanstatten structure.
AB - Powder metallurgic Ti2AlNb alloys were sintered at 900 °C, 990 °C, 1060 °C, and 1100 °C (i.e. in the O + B2, α2 + B2 + O, α2 + B2, and B2 phase region, respectively) for 12 h, followed by water quenching and furnace cooling. Quenching was employed to reserve the high-temperature phase and microstructure, and furnace cooling aimed to regulate the room-temperature microstructure for the enhancement of hardness. Widmanstatten B2 + O structure, which contributes to the properties, was induced from B2 crystals by sintering, unless the alloy was treated in the α2 + B2 phase region. With the elevation of the sintering temperature, the content of α2 phase became lower in the furnace-cooled alloys, and the hardness was improved accordingly. The highest hardness performance, 389 ± 23 HV, was obtained in the alloy solution treated in the single B2 region, and the alloy was comprised of complete O + B2 Widmanstatten structure.
KW - Hardness
KW - Microstructure
KW - Powder metallurgy
KW - TiAlNb-based alloy
UR - http://www.scopus.com/inward/record.url?scp=85018936962&partnerID=8YFLogxK
U2 - 10.1016/j.apt.2017.04.009
DO - 10.1016/j.apt.2017.04.009
M3 - Article
AN - SCOPUS:85018936962
SN - 0921-8831
VL - 28
SP - 1719
EP - 1726
JO - Advanced Powder Technology
JF - Advanced Powder Technology
IS - 7
ER -