Abstract
Martensitic phases are intermediate phases in Ti alloys and have obvious effects on microstructure and properties of heat treated specimens. The martensitic transformation and phase stability of Ti alloys with high content Zr were investigated. The addition of high content Zr was found to greatly modify the β phase stability and martensitic transformation of Ti alloys. The β transus temperature of Ti–50Zr binary alloy is about 616°C. Simultaneously, the phase composition of the β quenched Ti–50Zr binary alloy is composed of whole α′ martensitic phase. Reversely, the Ti–30Zr–10Al–3.5V and Ti–50Zr–10Al–3.5V quaternary alloys have the higher β transus temperatures 779 and 636°C, respectively. However, phase composition is major α″ martensitic phase in β quenched Ti–30Zr–10Al–3.5V alloy and is major β phase in β quenched Ti–50Zr–10Al–3.5V alloy, respectively. This interesting martensitic transformation phenomenon does not conform to previous wide accepted martensitic transformation theories and laws of Ti alloys. The delayed martensitic transformation of aforementioned two quaternary alloys was considered to be caused by the local stresses resulting from the extra additions of Al and V alloying elements.
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