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首页> 外文期刊>Materials Science and Engineering >AlCoCuFeNi high-entropy alloy with tailored microstructure and outstanding compressive properties fabricated via selective laser melting with heat treatment
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AlCoCuFeNi high-entropy alloy with tailored microstructure and outstanding compressive properties fabricated via selective laser melting with heat treatment

机译：AlCoCuFeNi高熵合金，具有定制的组织和出色的压缩性能，通过选择性激光熔化和热处理制成

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摘要

The present study focused on changes in the microstructures and mechanical properties of AlCoCuFeNi high-entropy alloy (HEA) fabricated via selective laser melting (SLM) and subsequent heat treatment at temperatures of 900 degrees C and 1000 degrees C. The as-fabricated sample exhibits a single ordered body-centred-cubic (BCC)(B2) solid solution phase and fine columnar substructure with a strong 001 texture along the layer build-up direction. The heat treatment caused precipitation of the Cu-rich face-centred cubic (FCC) phase from the metastable BCC(B2) matrix, thus forming a dual phase structure in the heat-treated alloys. Heat treatment decreased the microhardness and compressive yield strength, but increased the ductility significantly as compared to the as-fabricated sample. This strength-ductility trade-off is related to the precipitation of the FCC phase, which can toughen the brittle HEA and result in apparent strain hardening. In particular, the sample heat-treated at 1000 degrees C exhibited a better compressive fracture strength of 1600 MPa, a yield strength of 744 MPa, and a strain of 13.1%. The improvement in mechanical properties is mainly attributed to the effective combination of the BCC(B2) and FCC phases. This study provides novel insights into the fabrication of AlCoCuFeNi HEM with tailorable microstructures and superior mechanical performance via a combined process of SLM and subsequent heat treatment.
机译：本研究的重点是通过选择性激光熔化（SLM）以及随后在900摄氏度和1000摄氏度的温度下进行热处理而制备的AlCoCuFeNi高熵合金（HEA）的微观结构和力学性能的变化。单一有序的体心立方（BCC）（B2）固溶体相和细的柱状子结构，沿着层构建方向具有很强的<001>纹理。热处理引起亚稳BCC（B2）基体中富Cu面心立方（FCC）相的析出，从而在热处理合金中形成双相结构。与制成的样品相比，热处理降低了显微硬度和抗压屈服强度，但显着提高了延展性。这种强度-延展性的权衡与FCC相的沉淀有关，这会使脆性HEA变硬并导致明显的应变硬化。特别地，在1000℃下热处理的样品表现出更好的1600MPa的压缩断裂强度，744MPa的屈服强度和13.1％的应变。机械性能的提高主要归因于BCC（B2）和FCC相的有效结合。这项研究通过结合SLM工艺和随后的热处理，为制造具有可定制微结构和卓越机械性能的AlCoCuFeNi HEM提供了新颖的见解。

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