应用光学显微镜、透射电镜及X射线衍射研究了Ti—42at.—％Al和Ti—45at.—％Al两种合金的固溶处理后的快冷组织,证明其为过饱和的有序α_2单相组织,过饱和单相在1000-1100℃等温转变时,以准连续和不连续的机制分解成为γ+α_2两相。准连续转变中包括γ片析出和胞状化两个阶段,并在原始α_2晶界处形成锯齿形边界。
A supersaturated single phase ordered α_2 structure in as rapidly quenched al-loys both Ti-42at.-%Al and Ti-45at.-%Al, after solid solution treatment, was revealed un-der observation with optical and transmission electron microscope as well as X-raydiffraction analysis. The supersaturated single phase may transform into a lamellar structureof γ+α_2 with a discontinuous decomposition mechanism in Ti-42at.-% Al alloy and with asemicontinuous decomposition mechanism in Ti-45at.-%Al alloy when it aged isothermallyin the two-phase range between 1000 and 1100℃. The semicontinuous transformation in-volves two process: precipitation of primary lamellar γ phase and subsequent formation ofcellular microstructure, in result, the initial even grain boundaries of α_2 become sawtooth.
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