Sc and Zr additions in Al matrix offer enormous potential for strengthening at elevated temperatures due to formation of coarsening resistant precipitates. The high-temperature properties of supersaturated Al-0.4Sc-0.4Zr at% alloy, produced via melt-spinning and extrusion, were studied in creep and elevated temperature compression. Given the larger amount of solute resulting from rapid solidification, the elevated temperature compressive strength of the supersaturated Al-0.4Sc-0.4Zr at% was significantly higher compared to dilute Al-0.06Sc-0.06Zr at%. The operating deformation mechanism at elevated temperatures in both alloys was dislocation climb, and the difference in threshold stress was assessed between Al-0.4Sc-0.4Zr at% and Al-0.06Sc-0.06Zr at%. The larger threshold stress in the supersaturated Al-0.4Sc-0.4Zr at% was attributed to the different microstructure due to the processing. The stress exponents and activation energies from the creep tests are consistent with the diffusion-controlled dislocation climb mechanism. The small grain size led to diffusional creep in the low stress regime in both alloys.

由于形成抗粗化析出物，在 Al 基体中添加 Sc 和 Zr 提供了在高温下强化的巨大潜力。研究了熔纺和挤压生产的过饱和Al-0.4Sc-0.4Zr at%合金在蠕变和高温压缩下的高温性能。鉴于快速凝固产生的大量溶质，过饱和 Al-0.4Sc-0.4Zr at% 的高温抗压强度明显高于稀 Al-0.06Sc-0.06Zr at%。两种合金在高温下的操作变形机制是位错爬升，并评估了 Al-0.4Sc-0.4Zr at% 和 Al-0.06Sc-0.06Zr at% 之间的阈值应力差异。过饱和的 Al-0.4Sc-0 中的阈值应力较大。4Zr at% 归因于加工不同的微观结构。蠕变测试的应力指数和活化能与扩散控制的位错爬升机制一致。小晶粒尺寸导致两种合金在低应力状态下的扩散蠕变。