摘要
Ti-45Al-2W-0.5Si-0.5B（ABB-23）铸造合金在800和 900℃长期时效过程中发生组织失稳,包括α2板条断裂和合并,α2相转变为B2相,针状B2相球化和长大,γ等轴晶的生成以及片层间距的增加.ABB-23合金的热稳定性优于无B的ABB-2合金,表明添加B有利于提高合金的热稳定性.ABB-23合金在700-800℃范围内的抗蠕变能力超过同比密度的抗热腐蚀高温合金IN738LC,具有优异的高温蠕变性能.此外,还对比了ABB-23合金与其他几种TiAl基合金的高温蠕变性能.
Microstructure, thermal stability and creep properties of cast intermetallic Ti-45A1-2W-0.5Si-0.5B (ABB-23) have been investigated. The results show that, during long-term aging at 800 and 900℃, microstructural instabilities occur in the ABB-23 alloy, including breaking and mergence of a2 laths, transformation of a2 phase to B2 phase, spheroidization and coarsening of needle-like B2 phase, formation of equiaxed γ grain in lamellar area, and increasing of lamellar spacing. Addition of B is demonstrated to be beneficial to the thermal stability of the alloy by comparing with its B-free counterpart ABB-2 alloy. The ABB-23 alloy shows superior creep-resistant ability in the temperature range of 700-800℃ over density-correct corrosion-resistant superalloy IN738LC. Additionally, its creep properties at high-temperature were also compared with other TiAl based alloys.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第11期1175-1180,共6页
Acta Metallurgica Sinica
关键词
金属间化合物
高温结构材料
TIAL
热稳定性
蠕变
intermetallics, high-temperature structural materials, TiAl, thermal stability, creep
