Abstract

Using the microindentation, X-ray diffraction, optical microscopy, and electron microscopy methods, the microstructure and bulk physical and mechanical properties (hardness, reduced elastic modulus, plasticity index, elastic recovery parameter) of two samples of the Al₉₀Gd₁₀ binary hypereutectic alloy (hereinafter, formula indices correspond to at %) are studied. The first sample is obtained by rapid cooling of the melt at a rate of 1000 degree/s at a high pressure of 10 GPa; the hardening temperature is 1800 K. The second sample is obtained by pressing the original sample with a high pressure of 5 GPa without melting. Compared to the intial sample, the microstructure of both samples is crushed and compacted. The structure of the initial sample is comprised of two equilibrium phases of α-Al and Al₃Gd. In the sample prepared without melting, a phase with composition Gd₅₅Al₄₅ is found in addition to the α-Al and Al₃Gd phases; in the sample prepared with melting, a phase with composition Al₉₂Gd₈ is found. Features of the structure morphology and changes in the phase composition of the samples prepared under high pressure lead to changes in the physical and mechanical properties of the studied alloy.

中文翻译：

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常压热处理后Al90Gd10二元合金的组织及物理力学性能

摘要

使用显微压痕、X 射线衍射、光学显微镜和电子显微镜方法，对 Al ₉₀ Gd _{10的两个样品的微观结构和整体物理机械性能（硬度、折减弹性模量、塑性指数、弹性回复参数）进行了分析。}研究了二元过共晶合金（以下，公式指数对应于at%）。第一个样品是通过在 10 GPa 的高压下以 1000 度/秒的速度快速冷却熔体获得的；硬化温度为1800 K。第二个样品是通过将原始样品用5 GPa的高压压制而不熔化而获得的。与初始样品相比，两种样品的微观结构都被压碎和压实。_{初始样品的结构由α-Al 和Al 3} Gd两个平衡相组成。在未熔融制备的样品中，除了α-Al和Al _{3 Gd相外，还发现了组成为Gd 55} Al ₄₅的相；在通过熔化制备的样品中，组成为 Al _92的相Gd ₈被发现。在高压下制备的样品的结构形态特征和相组成的变化导致研究合金的物理和机械性能发生变化。