SHS制备高熵合金块体及表征凝固组织

Preparation of High-Entropy Alloy Blocks by Self-Propagating High-Temperature Synthesis and Characterization of Solidification Structure

利用自蔓延高温合成技术(SHS)制备高熵合金,即以三氧化二铬、三氧化二铁、三氧化二钴、氧化镍、二氧化钛粉末及铝粉为试验原料。确定了反应物质量配比后均匀混合,并用镁条将其点燃,此时铝热反应立即开始,反应凭借自身持续放热迅速合成所需材料。表征铸态高熵合金与经热轧后合金的组织差异性,同时也为消除铸态块体中的空隙而对合金进行热轧处理。结果表明:高熵合金在经过热变形后获得了部分板织构,因此热轧态合金比铸态合金的晶粒尺寸大。其次讨论了SHS技术在实际应用中的特点、合金的微观组织与元素成分占比。

The high entropy alloy was prepared by self-propagating high temperature synthesis(SHS)with chromium sesquioxide,iron sesquioxide,cobalt sesquioxide,nickel oxide,titanium dioxide powder and aluminum powder as raw materials.After determining the weight ratio of the reactants,the mixture is evenly mixed and ignited with magnesium strips.Meanwhile,the aluminum thermal reaction begins immediately,and the reaction quickly produces the desired material by its own continuous heat release.The microstructure difference between the as-cast high-entropy alloy and the hot-rolled alloy was characterized.At the same time,the voids in the as-cast alloy were eliminated after the alloy was hot-rolled.The results demonstrate that the sheet texture appears in the high-entropy alloy after heat deformation,so the hot rolled alloys own bigger grain size than as-cast alloys.Moreover,the article discusses the characteristics of SHS technology in practical application and studies the microstructure of the alloy and the proportion of element components.As a new preparation method,the preparation of high-entropy alloy by self-propagating high-temperature synthesis technology provides a theoretical basis for the subsequent preparation of high-performance materials.