Effect of Cooling Rate on the Phase Formation of AlCoCrFeNi High-Entropy Alloy
Effect of Cooling Rate on the Phase Formation of AlCoCrFeNi High-Entropy Alloy
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DOI：
10.1007/s11669-021-00918-5
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发表时间：
2021-08
影响因子：
1.4
通讯作者：
Praveen Sreeramagiri;A. Roy;G. Balasubramanian
中科院分区：
文献类型：
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作者：
Praveen Sreeramagiri;A. Roy;G. Balasubramanian
高熵合金由于某些合金成分所表现出的显著的结构特性而受到极大的关注。然而，这些性质与这些合金合成期间经受的晶体相变密切相关。使用分子动力学模拟，我们研究如何在合成过程中施加在合金熔体上的冷却速率影响等原子AlCoCrFeNi高熵合金的结晶（和玻璃形成）。增加的冷却速率有助于合金的严重过冷，降低结晶温度并促进相变。我们预测临界冷却速率为2.5 × 10 ~（10）K/s，超过此冷却速率，合金趋向于凝固成非晶相。我们的研究结果表明，较高的冷却速率施加严重的晶格畸变和显着提高由于位错密度和变形的孪晶的结构性能。
High-entropy alloys have received significant attention because of remarkable structural properties exhibited by certain alloy compositions. However, these properties are strongly correlated to the crystallographic phase transformations that are endured during the synthesis of these alloys. Using molecular dynamics simulations, we examine how the cooling rates exerted on the alloy melt during synthesis impact the crystallization (and glass formation) of equiatomic AlCoCrFeNi high-entropy alloy. An increased cooling rate contributes to severe undercooling of the alloy, reducing the crystallization temperatures and promotes phase transformations. We predict a critical cooling rate of 2.5 × 1010K/s beyond which the alloy tends to solidify into an amorphous phase. Our results reveal that higher cooling rates exert severe lattice distortion and significantly enhance the structural properties due to increase in dislocation density and deformation by twinning.