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1999•Acta Metallurgica SinicaRequires access

MICROSTRUCTURE TRANSFORMATION IN CAST TiAl-W-Si ALLOY

Yin Weimin

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Abstract

The effects of heat treatment and tungsten on microstructure in TiAl alloy have been investigated. The part of lamellar structure resolved at 1300℃ transformed from α to fine lamellar structure during cooling, and the unsolved part corarsened continuously and discontinuously. With increasing of tungsten content, the amount of β phase increases and has several kinds of morphology. Lamellar structure in the 1.5%W alloy is more stable than that in the 2.1%W alloy.DSC and microstructure analysis showed the process of phase transformation as: L→L+ β′→α+β′→α→α+γ+β″.

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What this paper is about

The effects of heat treatment and tungsten on microstructure in TiAl alloy have been investigated. The part of lamellar structure resolved at 1300℃ transformed from α to fine lamellar structure during cooling, and the unsolved part corarsened continuously and discontinuously. With increasing of tungsten content, the amount of β phase increases and has several kinds of morphology. Lamellar structure in the 1.5%W alloy is more stable than that in the 2.1%W alloy.DSC and microstructure analysis showed the process of phase transformation as: L→L+ β′→α+β′→α→α+γ+β″.

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Available abstract

The effects of heat treatment and tungsten on microstructure in TiAl alloy have been investigated. The part of lamellar structure resolved at 1300℃ transformed from α to fine lamellar structure during cooling, and the unsolved part corarsened continuously and discontinuously. With increasing of tungsten content, the amount of β phase increases and has several kinds of morphology. Lamellar structure in the 1.5%W alloy is more stable than that in the 2.1%W alloy.DSC and microstructure analysis showed the process of phase transformation as: L→L+ β′→α+β′→α→α+γ+β″.

Key concepts: Lamellar structure, Materials science, Microstructure, Alloy, Tungsten, Metallurgy, Phase (matter), Transformation (genetics)

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