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在Al-Pb二元难混溶合金的基础上添加其它的合金元素Ni,Y和Co,优化设计了新的Al_(82.87)Pb_(2.5)Ni_(4.88)Y_(7.8)Co_(1.95)多元难混溶合金。开展了该多元难混溶合金的快速凝固实验,对制备的薄带样品进行了结构表征、热稳定性分析以及显微组织形成的研究。结果表明,合金熔体在快速冷却过程中发生了液-液相分离,生成富Al和富Pb两液相;随后,富Al基体液相发生玻璃转变,形成铝基非晶合金基体,而富Pb液相凝固结晶后以球形晶态粒子形式均匀分布于铝基非晶基体中。研究表明,利用难混溶合金液-液相变原理,通过快速凝固技术可以设计和制备原位球晶粒子/非晶合金基复合材料。
On the basis of Al-Pb binary miscible alloy, other alloying elements Ni, Y and Co were added and the new Al 82.87 Pb 2.5 Ni 4.88 Y 7.8 7.8 1.95 Immiscible alloy. The rapid solidification experiment of the multi-element hard-miscible alloy was carried out. The structural characteristics, thermal stability and microstructure of the prepared thin strip samples were studied. The results show that liquid-liquid phase separation occurs during the rapid cooling of the alloy melt and two Al-rich and Pb-rich liquid phases are formed. Subsequently, the Al-rich liquid phase undergoes glass transformation to form an aluminum-based amorphous alloy matrix, Pb liquid phase solidified after the crystallization of spherical particles in the form of uniform distribution in the aluminum-based amorphous matrix. The results show that in-situ spherulitic grains / amorphous alloy matrix composites can be designed and prepared by rapid solidification technique by using the principle of immiscible alloy liquid-liquid phase change.