Ti－Al－Ga系及Ti－Al－Nb－Cr系α（α_2）／γ相平衡的研究

α(α_2)/γ PHASE EQUILIBRIA IN Ti-Al-Ga AND Ti-Al-Nb-Cr SYSTEMS

利用电子探针微区成分分析测定了Ｔｉ—Ａｌ—Ｇａ系，Ｔｉ—Ａｌ—Ｎｂ—Ｃｒ系低Ｇａ，低Ｎｂ和低Ｃｒ部分的α（α_２）／γ相平衡成分，推得了合金元素Ｇａ，Ｎｂ和Ｃｒ在α（α_２）／γ平衡相中的成分分配比Ｋ并利用分配比方程计算出了Ｇａ，Ｎｂ和Ｃｒ在不同温度下的γ相的稳定化参数结果表明，Ｇａ，Ｎｂ为γ相稳定化元素，Ｃｒ为α相稳定化元素．

The partial α(α_2)/γ phase equilibria in Ti-Al-Ga and Ti-Al-Nb-Cr systems at lower Ga,Nb and Cr were measured by EPMA.Composition distribution ratio equations of Ga,Nb,Cr in α(α_2)/γ equilibria phases were deduced and γ phase stabilization parameters of Ga,Nb,Cr at various temperatures were calculated by using equations.The results show that Ga and Nb are γ phase-forming elements,while Cr isαphase-forming element.