Abstract
A eutectoid decomposition of β→α + τ1 occurs during water quenching (WQ) and the corresponding formation mechanism in a γ‐TiAl alloy with Ru addition is studied. A novel morphology consisting of outer lamellar and inner net‐like eutectoid microstructure is observed. The α and τ1 products are determined to nucleate and grow with the same crystalline orientation in a eutectoid aggregation, respectively. No specific crystalline orientation is confirmed between α and τ1. The eutectoid reaction is found to be controlled by diffusion. Moreover, α and τ1 grow in a synchronous manner. The outer lamellar region absorbs Ti, but excludes both Ru and Al atoms to the center of the β matrix during the eutectoid reaction. Correspondingly, the high Ru and Al contents promote the sidewise growth of τ1 lamellae and result in the distinctions in microstructure with the outer lamellae.
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