Development of Al-Rich Al-Ti-V intermetallic alloys with duplex microstructures

Woong Seong Chang, B. C. Muddle

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Abstract

The phases, phase relationships and indentation behaviour observed in a series of Al-Ti-V alloys, based on the composition Al3Ti, have been characterised following chill casting and selected isothermal heat treatments. The results define two separate approaches to the development of duplex microstructures containing uniform fine-scale mixtures of metallic β-(Ti,V) solid solution and an L12-derived intermetallic phase. Although the chill-cast microstructures of Al70Ti10V20 and Al62Ti10V28 alloys retained metastable intermediate high temperature phases, duplex metallic-intermetallic microstructures, containing uniform fine-scale distributions of metallic β-(Ti,V) solid solution in a δ-Al3(Ti,V) intermetallic matrix, have been produced in both alloys during isothermal heat treatments at temperatures in the range 1073-1273 K. In contrast, two-stage heat treatments of an Al55Ti10V35 alloy, involving short term homogenisation at 1523 K followed by extended ageing in the range 1073-1273 K, produced a series of fine-scale, two-phase lamellar microstructures, consisting of alternating lamellae of β phase and twin-related ξ-Ti5Al11 laths. The cracking resistance of samples with such microstructures was significantly enhanced, while the hardness was maintained at or above that of monolithic δ-Al3Ti.

Original languageEnglish
Pages (from-to)233-243
Number of pages11
JournalMetals and Materials
Volume2
Issue number4
DOIs
Publication statusPublished - 1 Jan 1996

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