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研究了Al_(0.5)CoCrCuFeNiB_x(x=0~1)的组织、相组成、硬度及耐磨性能。并预测了Al_(0.5)CoCrCuFeNiB_x(x=0~1)中简单固溶体形成规律。未添加硼元素的合金具有简单fcc固溶体结构。添加硼元素后,合金由简单fcc固溶体及多元硼化物组成。硼以硼化物形式析出,没有固溶到fcc固溶体中,因而添加硼对fcc固溶体的晶格常数无影响。硼化物的析出使合金的硬度提高,并且硬度随着硼含量的增加而呈线性增加。当硼含量x≤0.4时,合金的磨耗阻抗变化不明显,但当硼含量x≥0.6时,合金的磨耗阻抗随着硼含量增加而呈线性增加。随着硼含量的增加,合金的磨损机制由粘着磨损转变为氧化磨损。合金硬度与耐磨性能的提高是高硬度的粗大硼化物与韧性的fcc固溶体基体共同作用的结果。
The microstructure, phase composition, hardness and wear resistance of Al_ (0.5) CoCrCuFeNiB_x (x = 0 ~ 1) were studied. The formation rules of simple solid solution in Al 0.5 CoCrCuFeNiB x (x = 0 ~ 1) were predicted. The boron-free alloy has a simple fcc solid solution structure. After adding boron element, the alloy consists of simple fcc solid solution and poly boride. Boron is precipitated as a boride and does not dissolve into the fcc solid solution, so addition of boron has no effect on the lattice constant of the fcc solid solution. The precipitation of boride increases the hardness of the alloy and the hardness increases linearly with increasing boron content. When the content of boron is less than or equal to 0.4, the wear resistance of the alloy does not change obviously. However, when boron content is more than or equal to 0.6, the wear resistance increases linearly with the increase of boron content. With the increase of boron content, the wear mechanism of the alloy changed from adhesive wear to oxidative wear. Increasing the hardness and wear resistance of the alloy is a result of the coexistence of a coarse boride with high hardness and a ductile fcc solid solution matrix.