Abstract Microstructure and hardness of the Al-Ca-Ni-Mn alloy fabricated by laser-powder bed fusion were studied in as-built condition and after annealing at 200–400 °C for 3 h. A formation of pseudoeutectic cellular structure and outstanding hardness of 200 HV were reported in the initial state. A decrease in hardness down to 161 HV after exposure at 300 °C and no further degradation occurred after heating up to 400 °C. The softening was accompanied by the growth of primary phase up to ~800 nm and eutectic phase to ~90 nm. The latter had the most contribution into hardening that was explained by Orowan looping mechanism.

中文翻译：

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激光-粉末床熔合制备的Al-Ca-Ni-Mn合金具有显着的热稳定性

摘要 研究了激光-粉末床熔融制备的 Al-Ca-Ni-Mn 合金在竣工状态和 200-400 °C 退火 3 h 后的组织和硬度。据报道，在初始状态下形成了假共晶细胞结构和优异的 200 HV 硬度。在 300 °C 下暴露后硬度降低至 161 HV，加热至 400 °C 后没有发生进一步的降解。软化伴随着主相生长至~800 nm 和共晶相生长至~90 nm。Orowan 循环机制解释了后者对硬化的最大贡献。