4.7 Article

Solidification characteristics of high Nb-containing γ-TiAl-based alloys with different aluminum contents

Journal

RARE METALS
Volume 34, Issue 6, Pages 381-386

Publisher

NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-014-0416-y

Keywords

Titanium aluminide; Crystal temperature range; Peritectic reaction; Dendrite morphology; Al-equivalent

Funding

  1. National Basic Research Program of China [2011CB605503]
  2. Program of Introducing Talents of Discipline to Universities [B08040]

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The effect of Al content on the microstructure and solidification characteristics of Ti-Al-Nb-V-Cr alloys in as-cast and isothermally treated states was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectroscope (EDS), and transmission electron microscopy (TEM). The typical solidification characteristics are due to the joint influence of both the crystal temperature range and the solidification path. The wide crystallization temperature range contributes to obtaining coarse dendrites in the as-cast Ti47Al7Nb2.5V1.0Cr (at%) alloy solidifying through the peritectic reaction. The beta-solidifying Ti46Al7Nb2.5V1.0Cr (at%) alloy with the narrow crystallization temperature range is attributed to the formation of a homogeneous fine-grained microstructure. However, the crystallization temperature range of Ti48Al7Nb2.5V1.0Cr (at%) alloy is equivalent to that of Ti46Al7Nb2.5V1.0Cr alloy, but it is solidified by peritectic reaction, leading to the formation of finer dendrites.

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