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应用X射线衍射测定了过饱和α2单相的Ti—45％Al合金在950℃等温分解过程中，初生片层形成时的γ相转变分数及α2和γ相晶格参数的变化.结果表明，初生片层中α2相是亚稳相，其成分可以由自由能成分曲线的亚稳态α2相与γ相自由能成分曲线公切线的切点确定，该成分的确定对定量计算合金自由能及发生不连续粗化的转变驱动力有十分重要的作用;等温分解过程中原α晶粒内部将产生相变应力，在垂直于初生片层的方向上可以产生约50MPa的压应力,该应力将对合金的组织形态有显著的影响
The γ phase transformation fraction and the α2 and γ phase lattice parameters of the supersaturated α2 single phase Ti-45% Al alloy during the isothermal decomposition at 950 ℃ were measured by X-ray diffraction. The results show that, The α2 phase in the nascent lamellae is a metastable phase whose composition can be determined by the tangent point of the common tangent of the curve of the free energy component of the free energy component curve and the metastable state of the γ phase component. It is very important to change the driving force of discontinuous coarsening. During the isothermal decomposition, the original α grains will generate phase transformation stress in the interior and compressive stress about 50 MPa in the direction perpendicular to the primary lamellae, Alloy morphology has a significant impact