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首页> 外文期刊>Journal of Materials Science >Microstructure, tensile properties, and creep behavior of high-pressure die-cast Mg–4Al–4RE–0.4Mn (RE = La, Ce) alloys
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Microstructure, tensile properties, and creep behavior of high-pressure die-cast Mg–4Al–4RE–0.4Mn (RE = La, Ce) alloys

机译：高压压铸Mg–4Al–4RE–0.4Mn（RE = La，Ce）合金的组织，拉伸性能和蠕变行为

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摘要

High-pressure die-cast (HPDC) Mg–4Al–4RE–0.4Mn (RE = La, Ce) magnesium alloys were prepared and their microstructures, tensile properties, and creep behavior have been investigated in detail. The results show that two binary Al–Ce phases, Al11Ce3 and Al2Ce, are formed mainly along grain boundaries in Mg–4Al–4Ce–0.4Mn alloy, while the phase composition of Mg–4Al–4La–0.4Mn alloy contains only α-Mg and Al11La3. The Al11La3 phase comprises large coverage of the grain boundary region and complicated morphologies. Compared with Al11Ce3 phase, the higher volume fraction and better thermal stability of Al11La3 have resulted in better-fortified grain boundaries of the Mg–4Al–4La–0.4Mn alloy. Thus higher tensile strength and creep resistance could be obtained in Mg–4Al–4La–0.4Mn alloy in comparison with that of Mg–4Al–4Ce–0.4Mn. Results of the theoretical calculation that the stability of Al11La3 is the highest among four Al–RE intermetallic compounds supports the experimental results further.
机译：制备了高压压铸（HPDC）Mg-4Al-4RE-0.4Mn（RE = La，Ce）镁合金，并对它们的微观结构，拉伸性能和蠕变行为进行了详细研究。结果表明，Al 11 Ce 3 和Al 2 Ce这两个二元Al-Ce相主要沿Mg-中的晶界形成。 4Al–4Ce–0.4Mn合金，而Mg–4Al–4La–0.4Mn合金的相组成仅包含α-Mg和Al 11 La 3 。 Al 11 La 3 相包括大的晶界区域覆盖和复杂的形貌。与Al 11 Ce 3 相相比，Al 11 La 3 具有更高的体积分数和更好的热稳定性。导致Mg-4Al-4La-0.4Mn合金的晶界得到更好的加强。因此，与Mg-4Al-4Ce-0.4Mn相比，Mg-4Al-4La-0.4Mn合金可获得更高的拉伸强度和抗蠕变性。在四种Al-RE金属间化合物中Al 11 La 3 的稳定性最高的理论计算结果进一步支持了实验结果。

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