Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Deformation and Phase Transformation of Disorder α Phase at (α+γ) two Phase Region in high Nb Containing TiAl alloy

Version 1 : Received: 31 May 2021 / Approved: 1 June 2021 / Online: 1 June 2021 (12:31:17 CEST)

How to cite: Zhou, H.; Kong, F.; Wang, Y.; Hou, X.; Cui, N.; Sun, J. Deformation and Phase Transformation of Disorder α Phase at (α+γ) two Phase Region in high Nb Containing TiAl alloy. Preprints 2021, 2021060033 (doi: 10.20944/preprints202106.0033.v1). Zhou, H.; Kong, F.; Wang, Y.; Hou, X.; Cui, N.; Sun, J. Deformation and Phase Transformation of Disorder α Phase at (α+γ) two Phase Region in high Nb Containing TiAl alloy. Preprints 2021, 2021060033 (doi: 10.20944/preprints202106.0033.v1).

Abstract

In this paper, the deformation and phase transformation of disorder α phase at (α + γ) two phase region in as-forged Ti-44Al-8Nb-(W, B, Y) alloy are investigated by hot compression and hot packed rolling. Detailed microstructural evolution demonstrates that the as-deformed microstructure is significantly affected by deformation conditions. The mircrostructure differences are mainly due to temperature drop and strain rate. The evolution of α lamelae into α grains is detailed descripted. Moreover, the disorder α lamellae can also be decomposed into some new α grains by the assisted decomposition mechanism of γ grains. Microstructure evolution model of current TiAl alloy at 1250 °C during hot rolling is built.

Subject Areas

TiAl alloy; disorder α phase; deformation behavior; phase transformation; continuous dynamic recrystallization; rolling

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