Light-weight high-temperature alloys are important to the transportation industry where weight, cost, and operating temperature are major factors in the design of energy efficient vehicles. Aluminum alloys fill this gap economically but lack high-temperature mechanical performance. Alloying aluminum with cerium creates a highly castable alloy, compatible with traditional aluminum alloy additions, that exhibits dramatically improved high-temperature performance. These compositions display a room temperature ultimate tensile strength of 400 MPa and yield strength of 320 MPa, with 80% mechanical property retention at 240 °C. A mechanism is identified that addresses the mechanical property stability of the Al-alloys to at least 300 °C and their microstructural stability to above 500 °C which may enable applications without the need for heat treatment. Finally, neutron diffraction under load provides insight into the unusual mechanisms driving the mechanical strength.

中文翻译：

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高温应用的高性能铝铈合金

轻质高温合金对运输行业很重要，因为重量，成本和工作温度是节能汽车设计的主要因素。铝合金在经济上填补了这一空白，但缺乏高温机械性能。将铝与铈合金化，可制得可铸造性高的合金，与传统的铝合金添加物相容，可显着改善高温性能。这些组合物在室温下显示出400 MPa的极限抗拉强度和320 MPa的屈服强度，并在240℃保持80％的机械性能。确定了一种机制，该机制解决了铝合金在至少300°C下的机械性能稳定性及其在500°C以上的微结构稳定性的问题，这可以使应用无需热处理。