Al含量对选区激光熔化Al_xCoCrFeNi(x=0.3,0.5,0.7,1.0)的显微组织及纳米压痕的影响
Influence of Al content on microstructure and nanoindentation of selective laser melting Al_xCoCrFeNi(x=0.3,0.5,0.7,1.0)
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文摘
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采用气雾化法制备预合金粉末,通过选区激光熔化(selective laser melting,SLM)制备Al_xCoCrFeNi(x=0.3,0.5, 0.7,1.0)高熵合金。通过X射线衍射仪、扫描电镜以及纳米压痕实验,综合分析Al_xCoCrFeNi的物相、微观组织、硬度、杨氏模量及蠕变曲线,探讨Al含量对Al_xCoCrFeNi显微组织及纳米压痕的影响。结果表明:Al含量对物相组织有显著影响,其中Al_(0.3)CoCrFeNi与Al_(0.5)CoCrFeNi为FCC结构,Al_(0.7)CoCrFeNi和Al_(1.0)CoCrFeNi为BCC/B2结构。Al_(0.3) CoCrFeNi和Al_(0.5)CoCrFeNi主要由等轴晶组成,Al_(0.7)CoCrFeNi和Al_(1.0)CoCrFeNi主要由柱状晶组成。随Al含量增加,孔隙及裂纹等缺陷增加。在Al_(0.3)CoCrFeNi和Al_(0.5)CoCrFeNi中没有观察到明显的熔池形貌。随Al含量增加,样品残余应力增加。随Al含量增加,硬度增加,由Al_(0.3)CoCrFeNi的447HV增加至Al_(1.0)CoCrFeNi的567HV。Al_(0.3)CoCrFeNi杨氏模量约为273GPa,Al_(0.5)CoCrFeNi约为233GPa,Al_(0.7)CoCrFeNi和Al_(1.0)CoCrFeNi杨氏模量相近,分别为240GPa和242GPa,硬度与杨氏模量的变化主要与组织及物相有关。与传统蠕变曲线不同,Al_xCoCrFeNi的纳米压痕蠕变曲线只包括瞬时蠕变和稳态蠕变两个阶段,其蠕变机制主要为位错蠕变,其中Al_(0.7)CoCrFeNi具有最好的抗蠕变性能。Al_(0.3) CoCrFeNi具有最好的打印成形性,其屈服强度为702MPa,伸长率为27.5%。 |
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其他语种文摘
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Al_xCoCrFeNi(x=0.3,0.5,0.7,1.0)high-entropy alloy was fabricated by selective laser melting(SLM),and pre-alloyed powder was prepared by gas atomization.The phase composition, microstructure,hardness,Young's modulus and creep curve of Al_xCoCrFeNi were comprehensively analyzed through X-ray diffractometer, scanning electron microscope and nanoindentation experiments,respectively.The influence of Al content on the microstructure and nanoindentation of Al_xCoCrFeNi was discussed.The results show that Al_(0.3)CoCrFeNi and Al_(0.5)CoCrFeNi are FCC structure,while Al_(0.7)CoCrFeNi and Al_(1.0)CoCrFeNi are BCC/B2 structure.The microstructure of Al_(0.3)CoCrFeNi and Al_(0.5)CoCrFeNi are mainly composed of equiaxed crystals,while Al_(0.7)CoCrFeNi and Al_(1.0)CoCrFeNi are mainly composed of columnar crystals.It indicates that the content of Al has great influence on the microstructure of Al_xCoCrFeNi high-entropy alloy.With the increase of Al content,defects such as pores and cracks in the specimens increase.There is no obvious molten pool morphology observed in Al_(0.3)CoCrFeNi and Al_(0.5)CoCrFeNi.The residual stress increases with the increase of Al content.The hardness and Young's modulus of the samples were measured.It was found that with the increase of Al content,the hardness of the sample increases from 447HV to 567HV.The Young's modulus of Al_(0.3)CoCrFeNi is about 273GPa,and Al_(0.5)CoCrFeNi is about 233GPa,while Al_(0.7)CoCrFeNi and Al_(1.0)CoCrFeNi are about 240GPa and 242GPa,respectively. The changes in hardness and Young's modulus are mainly related to the microstructure and phases of specimens.Different from the traditional creep curve,the creep curve of Al_xCoCrFeNi includes only two stages,which are instantaneous creep and steady-state creep.The creep mechanism is mainly dislocation creep.Among the samples,Al_(0.7)CoCrFeNi has the best creep resistance.Al_(0.3) CoCrFeNi has the best print formability,with the yield strength of 702MPa,and the elongation is 27.5%. |
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来源
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材料工程
,2022,50(6):27-35 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.000737
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关键词
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选区激光熔化
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Al_xCoCrFeNi
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显微组织
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纳米压痕
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地址
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中南大学, 粉末冶金国家重点实验室, 长沙
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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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山东省自然科学基金
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文献收藏号
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CSCD:7261504
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