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Effects of Cooling Rate and Ti Content on the Solidification Characteristics of Al-Ti Alloys
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Effects of Cooling Rate and Ti Content on the Solidification Characteristics of Al-Ti Alloys
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Effects of Cooling Rate and Ti Content on the Solidification Characteristics of Al-Ti Alloys
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Journal Article
Effects of Cooling Rate and Ti Content on the Solidification Characteristics of Al-Ti Alloys
2025
Overview
In this paper, the solidification characteristics of Al-Ti alloys and the precipitation behavior of Al
3
Ti phases at different Ti contents and cooling rates were investigated by cooling curve thermal analysis. By heating the Al-
x
Ti (
x
= 1, 2, 3) alloys melt to 1100 °C and cooling it under near-equilibrium solidification and non-equilibrium solidification conditions, the precipitation growth characteristics of the Al
3
Ti phase were analyzed under each solidification condition. The results demonstrated that the precipitation temperatures of the Al
3
Ti phase in Al-
x
Ti (
x
= 1, 2, 3) alloys increased from 774.65 to 920.26 °C with the increase in Ti content from 1 to 3 wt.% under the condition of near-equilibrium solidification. Under the condition of non-equilibrium solidification, the volume fraction of the Al
3
Ti phase and the size of the Al
3
Ti phase formed by solidification at the mold temperature of 200 °C were larger than those at the mold temperature of room temperature. With the increase in Ti content, the volume fraction of the Al
3
Ti phase increased gradually, and the size of the Al
3
Ti phase increased first and then decreased, the yield strength and the tensile strength of the Al-
x
Ti (
x
= 1, 2, 3) alloys increased, which reached the maximum values of 82.15 and 106.12 MPa at a Ti content of 3 wt.% under the condition of room-temperature mold casting. The morphology of the Al
3
Ti phase gradually changed from petal-like to block-like, needle-like, and finally to short needle-like. During the solidification process, Al-
x
Ti (
x
= 1, 2, 3) alloys preferentially formed Al
3
Ti precipitated phases. As the heterogeneous nucleation core, the Al
3
Ti phase greatly promoted the nucleation of α-Al, resulting in a decrease in grain size, and the grain shape tended to be equiaxed.
Publisher
Springer US,Springer Nature B.V
