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Effect of Sc and Zr addition on structures and mechanical properties of rapidly solidified 7090 based alloys

机译：添加Sc和Zr对7090基快速凝固合金组织和力学性能的影响。

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摘要

Effect of minor addition of Sc + Zr has been studied on the structures and mechanical properties of rapidly solidified Al-9 percent Zn-2.5 percent Mg-1 percent Cu based alloys containing transition metals (Co, Fe, Fe+Ni, Mn). The amount of Sc and Zr addition was 0.2 mass percent each. Rapid solidification was performed by gas atomizing and splat quenching onto a water cooled Cu single roll. Consolidation of the flakes was done by cold pressing, vacuum degassing and hot extrusion. Uniform distribution of Al_3 (Sc, Zr) particles was observed by TEM in the as-extruded P/M materials with Sc + Zr addition. Hardness became higher for the as-extruded P/M materials with Sc + Zr addition than those without addition even after annealing at higher temperatures. Uniform distribution of Al_3 (Sc, Zr) and, eta' particles were observed in the T6 treated P/M materials. The size of, eta' particle is smaller than Al_3(Sc, Zr) particle. The T6 treated P/M materials with Sc+ Zr addition showed higher hardness than the as extruded materials. However, T6 treated alloys with Sc + Zr addition did not always show higher tensile strength and fatigue strength than those without addition.
机译：研究了少量添加Sc + Zr对快速凝固的含过渡金属（Co，Fe，Fe + Ni，Mn）的Al-9％Zn-2.5％Mg-1％Cu基合金的组织和力学性能的影响。 Sc和Zr的添加量分别为0.2质量％。通过气体雾化并在水冷的Cu单辊上淬火进行快速固化。薄片的固结是通过冷压，真空脱气和热挤压完成的。通过TEM观察，在添加了Sc + Zr的P / M材料中，Al_3（Sc，Zr）颗粒分布均匀。添加了Sc + Zr的刚挤出的P / M材料的硬度比没有添加的P / M材料更高，即使在高温下退火后也是如此。在经过T6处理的P / M材料中观察到Al_3（Sc，Zr）和eta'颗粒的均匀分布。 eta'颗粒的尺寸小于Al_3（Sc，Zr）颗粒。添加了Sc + Zr的经T6处理的P / M材料的硬度高于挤出材料。但是，添加了Sc + Zr的经T6处理的合金并不总是比未添加的合金具有更高的拉伸强度和疲劳强度。

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