Martensitic phase transformations in IMI 550 (Ti-4Al-4Mo-2Sn-0.5 Si)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Martensitic phase transformations in IMI 550 (Ti-4Al-4Mo-2Sn-0.5 Si)

Authors:	K K Kharia H J Rack

Affiliation:	(1) Department of Ceramic and Materials Engineering, Clemson University, 29634 Clemson, SC

Abstract:	The influence of solution-treatment temperature on the martensitic phase transformations observed in IMI 550 (Ti−4Al−4Mo−2Sn−0.5Si) has been investigated. When solution treatment is conducted at temperatures above 1233 K, a hexagonal martensite α′ is formed on rapid cooling. However solution treatment at temperatures between 1233 and 1123 K results in the formation of an orthorhombic martensite (α″) on rapid cooling. Finally, below 1123 K, the β phase is stable—no martensitic transformation occurs on rapid cooling. this transition from $\alpha ' \to \alpha _{primary} {\text{ + (}}\alpha {\text{ + }}\beta _{{\text{retained}}} ) \to {\text{ }}\alpha _{{\text{primary}}} {\text{ + (}}\alpha {\text{ + }}\beta _{retained} ) \to {\text{ }}\alpha _{{\text{primary}}} {\text{ + }}\beta _{metastable} {\text{ + }}\omega$ with decreasing solution-treatment temperature, is shown to be a result of alloy partitioning during solution treatment. Crystallographic analysis indicates that the transition in the martensite crystal structure with decreasing solution-treatment temperature is related to chemical short-range ordering (CSRO) in the high-temperature β phase.

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