中文摘要：

以高能球磨粉末为原料，研究了元素钴对93W-4．9Ni-2．1Fe合金性能和微观结构的影响。实验采用光学金相（OM）、扫描电镜（SEM）、EDAX能谱等方法对样品的组织形貌进行了表征；采用准静态拉伸试验对合金的抗拉强度、延伸率进行了测试，采用排水法对合金的相对密度进行了测算。实验结果表明：当Co含量为0-0．9％时，随Co含量增加，93W-Ni—Fe合金的抗拉强度、延伸率和相对密度由不添加Co时的997．2MPa、14．94％、99．27％分别提高为0．9％Co时的1024．7MPa、23．92％和99．40％；适量元素Co的加入会增加合金中钨晶粒的穿晶解理断裂和粘结相的延性撕裂、改善合金组织、提高合金的性能；当元素Co含量超过0．9％时，随Co含量增加，93W-Ni-Fe合金的性能有所降低，Co含量为1．5％时，合金抗拉强度降至1006．3MPa，延伸率降至21．96％。

英文摘要：

Effects of element Co additions on properties and microstructure of 93W-4.9Ni-2.1Fe alloy were investigated deeply. The strength and elongation of alloys were tested with quasi-static tensile testing machine. Optical microscope（OM）, scanning electricity microscope （SEM） and EDAX energy spectrum were used to analyze the microstructure and compositions of the alloys, respectively. The experimental result indicated when Co content was in the range from 0 to 0.9wt%, the properties of 93W-Ni-Fe alloy enhanced obviously with it increasing. The tensile strength, elongation and relative density of 93W-Ni-Fe alloys increased from 997.2 MPa, 14.94%, 99.27% without Co addition to 1024.7 MPa, 23.92% and 99.40% with 0.9wt%Co addition, respectively. It is indicated that the properties were enhanced with proper Co addition because of increasing of the transcrystalline fracture and ductile tearing of the matrix. When the Co content was in excess of 0.9wt%, mechanical properties of 93W-Ni-Fe alloy reduced, i.e. the tensile strength and elongation of alloys reduced to 1006.3 MPa and 21.96% with 1.5wt%Co addition.