Mo-CCN-ZrO_(2)复合材料显微组织及性能研究

Microstructure and mechanical properties of Mo-CCN-ZrO_(2)composite

以难熔金属钼为基体,添加相应比例的3Y-ZrO_(2)(Y_(2)O_(3)稳定ZrO_(2))粉体和球形CrCoNi(CCN)中熵合金粉体、C粉,通过固固混合、粉末冶金法制备典型的耐烧蚀钼基复合材料Mo-0.65%CCN-2.0%ZrO_(2)。系统研究Mo-0.65%CCN-2.0%ZrO_(2)钼基复合材料显微组织、不同加工变形条件下力学性能及抗氧化能力。结果表明:随变形量增大,晶粒得到细化,第二相粒子分布均匀,材料抗拉强度、伸长率、抗弯强度、断裂韧性等力学性能显著提高;在变形量达65%时,抗拉强度达812 MPa,屈服强度为696 MPa,伸长率为26.2%,抗弯强度为1707 MPa,断裂韧性为32.3 MPa·m1/2;材料断裂类型表现为典型韧性断裂特征,材料的抗氧化能力显著改善。

The certain proportion of 3 Y-ZrO_(2)(Y_(2)O_(3)stabilized ZrO_(2))powder and spherical CrCoNi(CCN)medium-entropy alloy powder and C powder was added into the molybdenum powder which serveas substrate.A typical ablation-resistant molybdenumbased composite material Mo-0.65%CCN-2.0%ZrO_(2)composite was successfully prepared by using the solid-solid mixing method and powder metallurgy.Microstructure,mechnical properties and antioxidant capacity of Mo-0.65%CCN-2.0%ZrO_(2)composites under different processing deformation conditions were studied systemically.The results show that as the amount of deformation increases,the grain size reduces and the distribution of second phase particles becomes even.As well as tensile strength,yield strength,elongation percentage,bending strength and fracture toughness improve significantly,and they reach to 812 MPa,696 MPa,26.2%,1707 MPa and 32.3 MPa·m1/2 respectively when the deformation is 65%.The fracture of the material shows typical ductile fracture characteristics,and the antioxidant capacity improves dramatically.