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TiAl 金属间化合物可望成为航空航天器的下一代轻型高温结构材料,但它是典型的难加工材料,迄今制出的发动机涡轮叶片和机匣等试验件都是铸造或锻造的厚件。要将 TiAl 用于航天飞机和航空发动机的高温钣金结构,就要开发 TiAl 板材及其成形技术。日本三菱重工业公司名古屋航空航天系统制作所的科技人员认为,超塑成形是 TiAl 钣金成形不可缺少的方法,他们和日本神户制钢所共同致力于 TiAl 超塑性板材和超塑成形技术研究。Ti-45%～49%Al 二元合金经过热挤压(1200℃,挤压比4)
TiAl intermetallics are expected to be the next generation of lightweight high temperature structural materials for aerospace vehicles but it is a typical hard-to-machine material to date. Engineered test pieces such as turbine blades and casings have been cast or forged thicknesses. To use TiAl for the high-temperature sheet metal structures of space shuttles and aero-engines, TiAl sheets and their forming techniques have been developed. Japan’s Mitsubishi Heavy Industries Nagoya Aerospace Systems Corporation’s scientific and technological personnel believe that superplastic forming TiAl sheet metal forming an indispensable method, they and Japan’s Kobe Steel jointly committed to the TiAl superplastic sheet and superplastic forming technology research. Ti-45% ~ 49% Al binary alloy after hot extrusion (1200 ℃, extrusion ratio 4)