激光增材制造Al_xCoCrFeNi高熵合金的组织与性能
Microstructure and properties of Al_xCoCrFeNi high entropy alloys fabricated by laser additive manufacturing
查看参考文献25篇
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文摘
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为了研究Al含量对FeCoCrNi合金组织性能的影响,采用多路送粉激光熔覆设备高通量制备Al_xCoCrFeNi高熵合金(0≤x≤0.9),通过X射线衍射仪、金相显微镜、扫描电子显微镜、电子探针和显微硬度计测试合金的相组成、显微组织结构、成分和硬度。结果表明:随着Al含量的增加,Al_xCoCrFeNi高熵合金由单一FCC相(x≤0.35)转变为FCC+BCC双相结构(0.35
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其他语种文摘
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In order to study the effect of Al content on the microstructure properties of FeCoCrNi alloy, Al_xCoCrFeNi high-entropy alloy (0≤x≤0.9) was prepared by multi-channel laser cladding. The phase composition, microstructure, chemical composition and hardness of the alloy were test by X-ray diffractometry, metallography microscope, scanning electron microscope, electron probe and microhardness tester. The results show that with the increase of Al content, Al_xCoCrFeNi high-entropy alloy changes from single FCC phase(x≤0.35) to FCC+BCC biphase structure(0.35<x<0.85), and finally to BCC structure (x≥0.85). The microstructure of the high entropy alloy consists of epitaxial columnar dendrites and uniform equiaxed dendrites. When Al content reaches to x=0.5, characteristic structure of spinodal decomposition with alternating light and dark contrast starts to appear between the dendrites, which consists of disordered phase A2 and ordered phase B2. The microhardness test results show that the microhardness of Al_xCoCrFeNi alloys almost increases with the increasing Al content and a total of 146% improvement has been achieved when the Al content increases from x=0 to x=0.9. It should be noted that cracks begin to appear in the alloy when the Al content increases to a certain value (x≥0.6). The size and density of cracks increase with the increase of Al content. There are two main reasons. Firstly, the hotcracking increases since the solidification range widen and their viscosity values near the solidification temperatures increase with the increasing Al content. Besides, cold cracking also increases as the brittle BCC and σ phases increase with the increasing Al content. |
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来源
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材料工程
,2024,52(1):220-230 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000781
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关键词
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激光熔覆
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高熵合金
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Al_xCoCrFeNi
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相组成
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微观组织
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地址
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1.
烟台大学精准材料高等研究院, 山东, 烟台, 264005
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中南大学, 粉末冶金国家重点实验室, 长沙, 410083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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泰山学者工程专项经费资助
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山东省高等学校青年创新团队发展计划
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文献收藏号
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CSCD:7652207
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