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Development of Magnesium Powder Metallurgy AZ31 Alloy Using Commercially Available Powders

机译：使用市售粉末开发镁粉末冶金AZ31合金

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Magnesium and its alloys are attractive materials for use in automotive and aerospace applications because of their low density and good mechanical properties. However, difficulty in forming magnesium and the limited number of available commercial alloys limit their use. The present work reviews the efforts to improve the attractiveness of magnesium through non-traditional processing, and presents the results of producing AZ31 magnesium alloy via powder metallurgy P/M. P/M can be, used to alleviate the formability problem through near-net-shape processing, and also allows unique chemical compositions that can lead to the development of new alloys with novel properties. The feasibility of producing magnesium powder metallurgy products utilizing the industrially dominant process of mixed powder blending, uni-axial die compaction and controlled atmosphere sintering was investigated. An alloy composition based on the commercial Mg alloy AZ31 (3 mass % Al, 1 mass % Zn) was used to facilitate the comparison to similar wrought product. The optimal processing conditions (compaction pressure, sintering time and temperature) were found to maximize sintered density and mechanical properties. Results show that sintering temperature is one of the major variables that has an appreciable effect on the final properties of the samples, and that the effects of compaction pressure and sintering time were insignificant. The material showed poor tensile properties, with a maximum tensile strength of 32 MPa due to lack of sufficient densification. The latter was related to the lack of liquid phase formed during sintering of Al/Zn magnesium alloys and the barrier to diffusion due to the presence of the stable magnesium surface layer.
机译：镁及其合金由于其低密度和良好的机械性能而成为用于汽车和航空航天应用的有吸引力的材料。然而，形成镁的困难和可用的商业合金的数量有限，限制了它们的使用。本工作回顾了通过非传统工艺提高镁吸引力的努力，并提出了通过粉末冶金P / M生产AZ31镁合金的结果。 P / M可用于缓解通过近最终形状加工产生的可成型性问题，并且还可以实现独特的化学成分，从而导致开发出具有新性能的新型合金。研究了利用混合粉末共混，单轴模具压制和可控气氛烧结的工业主导方法生产镁粉冶金产品的可行性。为了促进与类似锻造产品的比较，使用了基于市售Mg合金AZ31的合金成分（3质量％Al，1质量％Zn）。发现了最佳加工条件（压制压力，烧结时间和温度），以使烧结密度和机械性能最大化。结果表明，烧结温度是影响样品最终性能的主要变量之一，而压制压力和烧结时间的影响不明显。该材料显示出较差的拉伸性能，由于缺乏足够的致密化，其最大拉伸强度为32 MPa。后者与在Al / Zn镁合金的烧结过程中缺乏液相形成以及由于存在稳定的镁表面层而导致的扩散壁垒有关。

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