作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《粉末冶金材料科学与工程》 2006年第4期206-209,共4页

摘　　要： 为加速高性能TiAl基金属间化合物的研发,以相图热力学计算结果为基础,研究合金化元素Nb、W、B和热处理温度、冷却速度对TiAl基金属间化合物的相转变、微观结构的影响。研究结果表明:对成分为Ti-45Al-7Nb-0.4W-0.15B(原子百分比)的TiAl基金属间化合物在1 450℃进行均匀化退火处理,高温下的α相经炉冷可以得到完全由α2/γ片层团构成的较为粗大的全片层组织;在1 235℃进行均匀化热处理可以获得细小的双态组织。上述关键性的热处理实验和微观结构分析证实了理论计算结果的可行性。 With the aim of speeding up the research and development of the TiAl intermetallics and on the basis of the calculation results of Phase Diagram Thermodynamics, the effects of alloying elements, Nb, W and B, as well as heat treatment temperature and cooling speed on the phase transform and microstructure of the Ti-45Al-7Nb-0.4W- 0.15B （atomic fraction, %） intermetallics were investigated. The results show that by using a processing approach which includes homogenizing annealing at 1 450 ℃ in the α single phase field followed by furnace cooling, a rather bulky and fully lamellar structure consisting of parallel laths of the α2 and γ phases was produced in titanium aluminides. Also what produced in this experiment was a duplex structure, where the grains of γ are interspersed with some lamellar structures, during homogenization heat treatment at 1 235 ℃ in the α＋ γ two-phase regions. The above heat treatment experiments and microstructure analysis identified tb.e feasibility of tb.e theoretical calculation for the phase diagram thermodynamics.

关 键 词： 相图 热力学计算 合金设计 基金属间化合物

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]