增材制造同时增强AlCoCrFeNi 2.1共晶高熵合金的强度-塑性

Liufei Huang, Yao Sun, N. Chen, Hengwei Luan, G. Le, Xue Liu, Yaqi Ji, Yiping Lu, P. Liaw, Xiaoshan Yang, Yuzhao Zhou, Jin-Feng Li
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引用次数: 3

摘要

增材制造过程中热循环的负面影响对组织的控制提出了挑战,从而使产品的性能优于铸件。采用激光金属沉积(LMD)法制备了AlCoCrFeNi2.1共晶高熵合金(EHEA)。与铸造样品相比,lmd制备的EHEA抗拉强度显著提高(提高19.7%),拉伸塑性显著提高(提高56.4%)。这种力学性能的增强是由于均匀分布的共晶结构的细化,该共晶结构由韧性FCC(L12)相和强BCC(B2)相组成,其中嵌入了高密度的纳米析出物。这些纳米沉淀物有效地固定了位错,导致了应变硬化/位错积累能力。本研究为利用LMD的高冷却速度和共晶组织特性来获得均匀的组织和优于传统加工技术的力学性能提供了一种新的策略。
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Simultaneously Enhanced Strength-Ductility of AlCoCrFeNi 2.1 Eutectic High-Entropy Alloy via Additive Manufacturing
The negative effects of thermal cycles in the process of additive manufacture present a challenge for the control of microstructure so as to fabricate the products with improved properties compared to cast. In this work, AlCoCrFeNi2.1 eutectic high entropy alloy (EHEA) was prepared by laser metal deposition (LMD). Comparison with the cast samples, the LMD-fabricated EHEA showed significantly enhanced tensile strength (by 19.7%) and increased tensile ductility (by 56.4%). Such enhancement in mechanical properties owing to the refinement of the uniformly distributed eutectic-structure, which was composed of a ductile FCC(L12) phase and a strong BCC(B2) phase embedded with a high density of nano-precipitates. These nano-precipitates effectively pinned the dislocations, resulting strain hardening/dislocation accumulation capability. The present work provides a new strategy to utilize both the high cooling rates of LMD and the eutectic-structure characteristics for achieving homogeneous structures and superior mechanical properties to those prepared by traditional processing techniques.
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