摘要
利用电子探针微区成分分析测定了Ti-Al-Si系低Si部分的α(α2)/γ相平衡关系,并进行了热力学分析.结果表明,相对于Ti-Al二元系,Si的加入使α(α2)/(α(α2)+γ)相界线向富Ti方向移动,而(α(α2)+γ)/γ相界线变化不大;Si具有细化片层组织的作用,井使其粗化困难;Si在α(α2)相中的溶解度大于γ相,为α相稳定化元素;Si含量为1.0%(原子分数)时,组织中出现第三相Ti5Si3.
The partial α(α2)/γ phase equilibria in Ti-Al-Si ternary system at low Si concentration were measured by EPMA and examined with thermodynamic analysis. The results show that the addition of Si in Ti-Al binary system results in the α(α2)/ (α(α2)+γ) phase boundary shifting to Ti-rich side, whereas the (α(α2)+γ/γ) phase boundary shifting little. Si has effect on refining lamellar microstructure and makes the lamellae coarsen difficultly. The Si solubility in α(α2) phase is higher than that in γ phase thereas Si is an αphase-forming element in Ti-Al binary system. A third phase Ti5Si3 appears in the system with Si addition up to 1 .0% (atomic fraction).
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第11期1171-1176,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
相平衡
钛铝硅合金
三元系
Ti-Al-Si ternary system, partial vertical section, α(α_2) / γ phase equilibrium