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冷却速率和固体分量的对Rheo-Die造中的α-Al相位演变的影响:相位场模拟和实验调查

Song Chen^1,2,3, Wangwang Kuang⁴, Jian Feng^1,2

¹State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., Ltd., Beijing 100088, China.

Materials (Basel, Switzerland)

|September 13, 2025

概括

这项研究揭示了在半固体造过程中冷却速度如何影响合金微结构. 高冷却速率促进了二次的形成,而较高的固体分数则限制了它.

科学领域:

材料科学材料科学材料科学
金工业是金工业的一个方面.
造技术造技术造技术

背景情况:

了解半固体金属造微结构对于材料性能至关重要.
高固体分量过程在控制微观结构方面存在独特的挑战.
现有的模型往往缺乏用于复杂冷却过渡的动态模拟能力.

研究的目的:

为了研究高固体分数半固体rheo-die造过程中的动态微观结构演变.
开发和验证一个相场模型,以模拟在不同冷却速率下持续固化.
在不同的加工条件下分析Al-7Si合金中α-Al相的形态演变.

主要方法:

开发了一种新的相场模型,将连续冷却与显式核结合在一起.
集成了旋转热平衡装置 (SEED) 用于泥制备.
进行了分级冷却模具实验,以确定可变的冷却速率和固体分数条件.
在Al-7Si合金上进行实验和模拟调查.

主要成果:

在I阶段泥制备过程中观察到初级α1-Al阶段的奥斯瓦尔德成熟 (0.1-0.3 K/s).
初级α1-Al在中度冷却速率 (15K/s) 下在第二阶段流模造中继续增长.
二次α2-Al形成高度依赖于冷却速度和固体分数.
高冷却速率 (150 K/s) 导致α2-Al的爆炸性核化,而中等速率 (15 K/s) 抑制了它.
高冷却速率提高了溶液的捕获和构成性的低冷却,促进了二级阶段的形成.

结论:

开发的相场模型准确地捕捉了在两阶段冷却过程中的微观结构演变.
冷却速度和固体分数是控制二次α2-Al形成的关键参数.
高冷却速率有利于通过溶液捕获形成二次相,而高固体分数通过减少凝固窗口来限制它.

关键词:

冷却速度的冷却速度微观结构的微观结构阶段场模型阶段场模型主要的α1-Al是什么在Rheo-Die的演员中.二次性 α2-Al 的情况.一个半固体半固体.固体分数固体分数

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