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A Low-Cost Lightweight Entropic Alloy with High Strength

机译：低成本轻量级熵合金，具有高强度

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摘要

In this study, a series of lightweight Al-Mg system entropic alloys containing Zn, Cu, and Si were designed based on the order/disorder or entropy, and eutectic concepts. The alloys of Al58.5Mg31.5Zn4.5Cu4.5Si1; Al63Mg27Zn4.5Cu4.5Si1; Al66.7Mg23.3Zn4.5Cu4.5Si1; Al80Mg14Zn2.7Cu2.7Si0.6; Al85Mg10.5Zn2.025Cu2.025Si0.45; and Al90Mg7Zn1.35Cu1.35Si0.3 were prepared by induction melting under a high-purity argon atmosphere and then casted into stainless steel molds. The microstructures which were tested in the as-cast state exhibited multiphases and contained apparent volume fractions of intermetallic compounds and solid solutions. Then, the compressive mechanical properties of the alloys were measured, and high fracture strengths of 577, 677, 590, 498, 814, and 794MPa, respectively, were determined. Strong hardening phenomena were observed in the Al80Mg14Zn2.7Cu2.7Si0.6, Al85Mg10.5Zn2.025Cu2.025Si0.45, and Al90Mg7Zn1.35Cu1.35Si0.3 alloys at room temperature, with amazing plasticity percentages of 13.8, 24.8, and 32.7%, respectively. The property differences in the lightweight alloys were analyzed using the following parameters: the critical values of the enthalpy of mixing; atomic size differences; ratio of entropy to enthalpy; valence electron concentration (VEC); and Pauling electronegativity difference. Finally, three of the aforementioned parameters (atomic size difference, enthalpy of mixing, and Pauling electronegativity difference) were regarded in this study as the crucial rules for the lightweight multicomponent alloys.
机译：在本研究中，基于订单/疾病或熵和共晶概念设计了一系列含有Zn，Cu和Si的轻量级Al-Mg系统熵合金。 Al58.5mg31.5zn4.5cu4.5si1的合金; Al63mg27zn4.5cu4.5si1; al66.7mg23.3x4.5cu4.5si1; AL80MG14ZN2.7CU2.7SI0.6; al85mg10.5zn2.025cu2.025si0.45;通过在高纯度氩气氛下通过感应熔化制备Al90mg7zn1.35cu1.35Si0.3，然后浇铸成不锈钢模具。在浇铸状态下测试的微结构表现出多壳，并包含金属间化合物和固体溶液的表观体积分数。然后，测量合金的压缩力学性能，测定577,677,590,498,814和794MPa的高断裂强度。在室温下在Al80mg14Zn2.7Cu2.7Si0.6，Al85mg10.5 Zn2.025cu2.025Si0.45和Al90mg7zn1.35Cu1.35Si0.3和Al90mg7zN1.35Cu1.35Si0.3和32.7％的令人惊叹的塑性百分比中观察到强硬化现象， 分别。使用以下参数分析轻质合金的特性差异：混合焓的临界值;原子大小差异;熵与焓的比率;价电子浓度（VEC）;和鲍鱼电负差异。最后，在本研究中将三个上述参数（混合焓，混合焓，鲍林电信差差异）作为轻质多组合合金的重要规则。

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