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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Thermal Stability of A357 Alloy With and Without the Addition of Zr
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Microstructure and Thermal Stability of A357 Alloy With and Without the Addition of Zr

机译：A357合金的组织和热稳定性，无需添加Zr

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摘要

The principal purpose of this research was to evaluate the effects of Zr on the microstructure and thermal stability of an A357 alloy that has been subjected to an aging treatment (T6) and thermal exposure (250 degrees C). The results show that the addition of Zr had a significant influence on the refinement of the grain size, which enhanced the hardness and tensile strength of the A357 alloy under the T6 condition. During thermal exposure at 250 degrees C, the rodlike metastable beta'-Mg2Si precipitates transformed into coarse equilibrium phase beta-Mg2Si precipitates, resulting in a significant drop in the hardness and tensile strength of the T6 heat-treated A357 alloy. However, after thermal exposure, coherent, finely dispersed Al3Zr precipitates were found to be formed in the T6 heat-treated A357 alloy. The addition of 0.1% Zr played a critical role in improving the high-temperature strength. Consequently, the A357 alloy with the addition of Zr demonstrated better mechanical properties at room temperature and high temperature than the alloy without Zr, in terms of both microstructure and thermal stability.
机译：该研究的主要目的是评估Zr对已经进行老化处理（T6）和热暴露（250℃）的A357合金的微观结构和热稳定性的影响。结果表明，Zr的添加对晶粒尺寸的改进有显着影响，这提高了T6条件下A357合金的硬度和拉伸强度。在250℃的热曝光期间，棒状稳定性β-Mg2SI沉淀成粗平衡相β-Mg2SI沉淀物，导致T6热处理A357合金的硬度和拉伸强度显着下降。然而，在热暴露后，相干，精细分散的Al3zR沉淀物被发现在T6热处理A357合金中形成。添加0.1％ZR在提高高温强度方面发挥了关键作用。因此，根据微观结构和热稳定性，A357合金在室温和高温下，在室温和高温下，在室温和高温下表现出更好的机械性能。

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