| 季鹏程， 马盼， 刘肖， 索传钧， 魏水淼， 王灿.激光选区熔化CoCrFeMnNi高熵合金微观组织及力学性能研究[J].轻工机械,2021,39(2):17-22 |
| 激光选区熔化CoCrFeMnNi高熵合金微观组织及力学性能研究 |
| Microstructure and Mechanical Properties of CoCrFeMnNi High Entropy Alloy Fabricated by Selective Laser Melting |
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| DOI：10.3969/j.issn.1005 2895.2021.02.004 |
| 中文关键词: 激光选区熔化 CoCrFeMnNi高熵合金 单一面心立方相 力学性能 |
| 英文关键词:SLM(selective laser melting) CoCrFeMnNi high entropy alloy FCC(single face centered cubic phase) mechanical properties |
| 基金项目:国家自然科学基金资助项目(051601110)；上海市"创新行动计划"基础研究领域项目(17JC1400600)；上海市"创新行动计划"基础研究领域项目(17JC1400601)；上海工程技术大学研究生创新项目（19KY0501）。 |
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| 中文摘要: |
| 为了探究采用金属增材制造技术对高熵合金的制备，课题组采用激光选区熔化技术（SLM）成功制备冶金结合良好的CoCrFeMnNi试样，并对成形件的微观组织及力学性能进行分析。研究发现SLM成形的CoCrFeMnNi高熵合金相为单一面心立方相（FCC）FeNi，样品微观组织在不同成形方向上呈各向异性：沿水平方向，内部以胞状晶为主；沿成形方向，内部以柱状晶为主，组织为“鱼鳞”状形貌，单个柱状晶粒最长为70 μm，穿过多个成形层并显现外延生长特征。EDS结果表明SLM成形件的各元素分布平均，未呈现显著的成分偏析。拉伸测试结果显示SLM成形件屈服强度和抗拉强度为569 MPa和690 MPa，延伸率为16％，相较于铸态件分别提高了145％和24％，而塑性比铸态件降低了63％。SLM成形件拉伸断口形貌呈现以脆性断裂为主的混合断裂特征。 |
| 英文摘要: |
| In order to investigate the metal additive manufacturing technology for the preparation of high entropy alloy, CoCrFeMnNi samples with good metallurgical bonding were successfully prepared by selective laser melting technology (SLM), and the microstructure and mechanical properties of the formed parts were analyzed. It was found that the microstructure of the CoCrFeMnNi high entropy alloy phase formed by SLM was a single face centered cubic phase (FCC) Fe2Ni2, and the microstructure of the sample is anisotropic in different forming directions. Along the horizontal direction, the interior was dominated by cellular crystals; along the forming direction, the interior was dominated by columnar crystals with a "fish scale" morphology, and the longest single columnar grain with a length of 70 μm was passing through multiple forming layers and showing epitaxial growth characteristics. The EDS results show that the distribution of elements in SLM forming parts is uniform, and there is no significant component segregation. The tensile test results show that the yield strength and tensile strength of SLM formed parts are 569 MPa and 690 MPa, and the elongation is 16%, which is 145% and 24% higher than that of the as cast parts, respectively. The plasticity is 63% lower than that of the as cast parts. The tensile fracture morphology of SLM forming parts shows the mixed fracture characteristic of brittle fracture. |
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