(中南工业大学粉末冶金国家重点实验室， 长沙 410083)
摘 要: 研究了97W-2Ni-1Fe重合金喂料的流变学行为， 测定了该合金注射成形试样的力学性能和烧结收缩率。结果表明：97W-2Ni-1Fe重合金喂料的流变行为可用假塑性体来描述， 产品的屈服强度达649 MPa， 断裂强度达936 MPa， 延伸率11.4%，硬度为HRC31， 其力学性能优于传统压制/烧结工艺产品， 且烧结收缩基本各向同性， 产品尺寸偏差范围为±0.02 mm。
关键字: 关键词: 金属注射成形 W-Ni-Fe 重合金 流变性能
（The State Key Laboratory for Powder Metallurgy,Central South University of Technology, Changsha 410083, P. R. China）
Abstract:The rheological behavior of 97W-12Ni-1Fe heavy alloy feedstock was studied. The mechanical properties and shrinkage behaviors of samples formed by injection molding were measured. The results show that the f low of the feedstock is essentially pseudoplastic in behavior and the mechanica l properties of MIM alloy are as follows: σb=936 MPa, σ0.2=649 MPa, δ=11.4% and HRC=31, which are compared favorably with those values obtained by conventional press/sinter process. In addition, it is determined that the sintering shrinkage is almost isotropic and the dimension deviation is within ±0.2 mm.
Key words: metal injection molding heavy alloy W-Ni-Fe rheological behavior
