FeCuCoY超细合金粉末胎体的烧结及其力学性能研究

Study on the sintering and mechanical properties of FeCuCoY ultrafine alloy powder matrix

采用共沉淀还原扩散法制备了不同Y含量的FeCuCoY超细合金粉,并采用真空热压机将之烧结为胎体试样块。重点研究了Y含量、烧结温度（700℃~900℃）对FeCuCoY胎体断口形貌、相对密度、硬度和抗弯强度的影响。实验结果表明：添加适量Y元素可明显改善FeCuCo超细合金粉胎体的硬度和抗弯强度,并能在一定程度上加快胎体烧结过程的进行。在不同的烧结温度下,FeCuCoY超细合金粉胎体的断口为沿晶断裂和穿晶断裂的混合型断口,且穿晶断裂所占比例随着温度的升高而增大;Y元素在合金中的最佳添加量为0.5wt.%,最佳烧结温度为800℃。此时,胎体的相对密度为98.0%,硬度为103.6HRB,抗弯强度为1531.41MPa。

In the paper FeCuCoY ultrafine alloy powder with different Y contents were prepared by co-precipitation and reduction method,and they were sintered to matrix test block by domestic vacuum thermo-compression machine.The effects of Y element content and sintering temperatures on the fracture morphology,relative density,hardness and bending strength of matrix were investigated intensively.The results show that adding proper content of Y element can improve the hardness and bending strength of the FeCuCo ultrafine alloy powder obviously and accelerate the sintering process of matrix to some extent.The fracture morphology of FeCuCoY ultrafine alloy powder matrix are the mixture of intergranular fracture and transgranular fracture at different sintering temperatures,and the transgranular fracture ratio enlarges with the temperature increasing.The optimum Y content was 0.5wt% in the FeCuCoY ultrafine alloy powder and the sintering temperatures of matrix was 800℃.Meanwhile,the relative density of the matrix is 98%,the hardness value can reach to 103.6HRB and the bending strength is up to 1531.41MPa.