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Development of creep-resistant magnesium casting alloys for high temperature automotive applications

机译：高温汽车应用的抗蠕变镁铸造合金的研制

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The low specific gravity of magnesium has made Mg-alloys attractive for automotive and aerospace applications. Conventional Mg casting alloys have been based on the Mg-Al system with additions of Zn, Mn or Si, e.g. AZ91 alloy (Mg-9.0Al-1.0Zn, wt.%). Such alloys, which have good castability, mechanical properties and corrosion resistance, are widely used in the automotive industry. However, due to the rapid degradation of the mechanical properties at elevated temperatures, especially the creep resistance, application of these alloys has been limited to specific components that operate at temperatures below 150°C. New creep-resistant Mg casting alloys are required for application as transmission cases (temperatures up to ～175°C), engine blocks (～250°C) and pistons (～300°C). The development of such high performance creep-resistant alloys requires the development of microstructures in the cast alloy that both prevent grain boundary sliding and restrict the motion of lattice dislocations within the primary α-Mg grains. The development of Mg-Al-Ca casting alloys is described where Ca-containing eutectic phases are precipitated along the grain boundaries and where dislocation motion within the grains is restricted due to solid solution hardening and the presence of dispersed nanoscale eutectic phases.
机译：镁的低比重使Mg-合金对汽车和航空航天应用具有吸引力。传统的Mg铸造合金已经基于Mg-Al系统，其中添加Zn，Mn或Si，例如， AZ91合金（Mg-9.0Al-1.0zn，wt.％）。具有良好可抵抗力，机械性能和耐腐蚀性的这种合金广泛用于汽车行业。然而，由于在升高的温度下的机械性能的快速降解，特别是蠕变抗性，这些合金的应用仅限于在低于150℃的温度下操作的特定组分。施用新的抗蠕变镁铸造合金作为传动装置（温度高达约175°C），发动机块（〜250°C）和活塞（〜300°C）。这种高性能抗蠕变合金的发展需要在铸造合金中发育微观结构，以防止晶界滑动并限制初级α-Mg晶粒内的晶格脱位的运动。描述了Mg-Al-Ca铸造合金的发展，其中沿着晶界沉淀的含Ca的共晶相，并且由于固溶硬化和分散的纳米级共晶相的存在，晶粒内的位错运动受到限制。

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