【摘要】 以Cr-Si-Ni合金粉末为原料,利用激光熔炼/快速凝固材料制备技术,制得了由金属硅化物Cr3Si及少量镍基固溶体γ组成的新型快速凝固γ/Cr3Si金属硅化物“原位”复合材料,该γ/Cr3Si金属硅化物“原位”复合材料显微组织由快速凝固初生Cr3Si树枝晶及枝晶间少量镍基固溶体γ/Cr3Si共晶组织组成。Cr3Si金属硅化物初生树枝晶体积分数随镍含量增加而减少,枝晶间γ/Cr3Si共晶组织体积分数随镍含量增加而增加。该激光熔炼/快速凝固γ/Cr3Si金属硅化物“原位”复合材料具有很高的硬度,并由于组织中韧性相镍基固溶体的存在及其细小均匀的快速凝固组织特征,而可望具有优良的强韧性配合。更多还原

【Abstract】 In this paper, rapidly solidified γ/Cr3Si metal silicide "in situ"composites were fabricated by laser melting/rapid solidification technology. The laser melted/rapidly solidified γ/Cr3Si metal silicide "in situ"composites have high hardness and rapidly solidified fine microstructure consisting of primary Cr3Si dendrites and the interdendritic eutectics. The volume fraction of the Cr3Si primary dendrites in the laser melted/rapidly solidified γ/Cr3Si metal silicide "in situ"composites decreases with the increasing nickel content. Because of the presence of the ductile nickel solid solution and the rapidly solidified fine microstructure, the γ/Cr3Si metal silicide "in situ"composites are expected to have good combination of strength and toughness.更多还原