(1. 桂林電子科技大學(xué) 廣西信息材料重點(diǎn)實(shí)驗(yàn)室，桂林 541004；
2. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 利用非自耗真空電弧熔煉技術(shù)，研究等摩爾Mn、V、Mo、Ti、Zr元素對(duì)AlFeCrCoCu多組元高熵合金的組織結(jié)構(gòu)、硬度及抗高溫氧化性能的影響。結(jié)果表明：6組合金都是典型的樹枝晶結(jié)構(gòu)，合金組織成分偏析嚴(yán)重，Cu元素大量聚集在晶間，其中，Ti和Zr元素對(duì)合金的組織影響最大，兩組合金都伴隨富Cr組織析出。合金具有較強(qiáng)的硬度，其硬度均與添加元素原子半徑成正比。熱重分析實(shí)驗(yàn)表明：合金具有較強(qiáng)的抗高溫氧化能力，在加熱到700 ℃以前，質(zhì)量幾乎保持不變，AlFeCrCoCu合金的抗高溫氧化性能最好，而第6元素的添加對(duì)合金的抗高溫氧化能力不利。其中，V和Mo元素的加入導(dǎo)致其產(chǎn)生的對(duì)應(yīng)氧化物具有易揮發(fā)特性而嚴(yán)重地惡化合金的抗高溫氧化性能。
關(guān)鍵字: 高熵合金；顯微組織；硬度；熱分析；高溫氧化
（1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China;
2. School of Materials Science and Engineering, Harbin Industrial University, Harbin 150001, China）
Abstract:A series of AlFeCrCoCu-X high-entropy alloys that X represents the Mn, V, Mo, Ti, Zr elements fabricated by an arc remelter were investigated by XRD, SEM, EDS, DSC and TG . The results show that 6 kinds of alloys exhibit dendritic structure, Cu preferentially segregates to the interdendritic regions, and the Cr-rich phase precipitates with adding Ti or Zr. The alloys have high hardness value, and their hardness increases with increasing the doped element radius. The alloys have strong ability to resist high temperature oxidation, their quality almost remain the same before heating to 700 ℃. The high temperature oxidation resistance of AlFeCrCoCu alloy is the best, and doping elements can reduce the high temperature oxidation resistance, Mo-oxides and V-oxides are volatiles that disrupt the formation of a protection scale and deteriorate the high temperature oxidation resistance of alloys.
Key words: high-entropy alloy; microstructure; hardness; thermoanalysis; high temperature oxidation
