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【特种合金】Ti对AlCoCrFeNiTix高熵合金微观组织和摩擦性能的影响
发布时间:2020-09-14 文章来源:本站原创
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黄蕾1    王雪洁王长征1   杨院生3

(1.聊城大学材料科学与工程学院; 2.青岛大学材料科学与工程学院; 3.中国科学院金属研究所)

摘要:为揭示Ti对高熵合金微观组织演变和磨损性能的影响机理,采用非自耗真空电弧熔炼炉制备了AlCoCrFeNiTix系高熵合金,探究其微观组织和摩擦性能。结果发现,随Ti含量增加,AlCoCrFeNiTix系高熵合金由单一的体心立方结构(BCC)转变为两种BCC结构,合金组织形貌由树枝晶转变为花瓣状等轴晶,AlNiTi主要分布于枝晶内,而FeCr主要富集于枝晶间。AlCoCrFeNiTi0.8合金硬度(HV)525.2,体积磨损量为6×10-4 mm3,具有最佳的耐磨性能。

关键词:高熵合金;非自耗真空电弧熔炼炉;微观组织;磨损性能

中图分类号:TG139;TG146   文献标志码    A

DOI:10.15980/j.tzzz.2020.05.023

 

Microstructure Evolution and Wear Resistance of AlCoCrFeNiTix High Entropy Alloys

Huang Lei1,  Wang Xuejie2,   Wang Changzheng1,  Yang Yuansheng3

(1.School of Materials Science and Engineering, Liaocheng University; 2.School of Materials Science and Engineering, Qingdao University; 3.Institute of Metal Research, Chinese Academy of Sciences)

Abstract:AlCoCrFeNiTix (x=0, 0.4, 0.8, 1.0) high entropy alloys (HEAs) were prepared by non consumable vacuum arc melting furnace. The microstructure and wear resistance of the AlCoCrFeNiTix were investigated. The experimental results reveal that high entropy alloys AlCoCrFeNiTix are transformed from a single body centered cubic structure (BCC) into two kinds of bodycentered cubic structures with the increase of Ti content, and the morphology of alloy is transformed from dendrites into the petal like equiaxed crystals. Meanwhile, there exists the enrichment of alloying element that Al Ni Ti elements are mainly distributed in dendrites, while Fe Cr elements are mainly concentrated between dendrites. In addition, the hardness and the volume of wear resistance of the AlCoCrFeNiTi0.8 HEAs reach 525.2 HV  and 6×10-4 mm3, indicating that AlCoCrFeNiTi0.8 HEAs have the desirable wear resistance.

Key Words: High Entropy Alloys, Non consumable Vacuum Arc Melting Furnace, Microstructure, Wear Resistance

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