OALib Journal期刊
全片层BT18Y钛合金在相区固溶时的显微组织演化
, PP. 713-720
Keywords: BT18Y钛合金 ,晶界？ ,相 ,球化
Abstract:
对BT18Y(Ti--6.9Al--3.6Zr--2.7Sn--0.7Mo--0.6Nb--0.21Si)钛合金进行了一系列的固溶处理,利用OM,SEM和TEM观察了在？+？两相区固溶后的显微组织形貌,发现连续的晶界？相发生了球化,一部分晶内初生？片端部具有“叉形”结构。分析了球化的原因和“叉形”结构的形成机理晶界？相表面曲率不同造成的溶质浓度差异而引起的扩散是晶界相球化的根本原因,不同晶界？片的交接对球化有一定的贡献；晶内初生？片的各个部位与？相之间的相界面结构和界面能的不同是造成？+？相区固溶时？片端“叉形”形貌的主要原因,？片端面与？相之间为高界面能易移动的非共格界面,在固溶时？相容易在该处向？片内生长形成？片,与之对应的？片便出现了“叉形”结构。
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