(中南工業(yè)大學粉末冶金國家重點實驗室， 長沙 410083)
摘 要: 研究了97W-2Ni-1Fe重合金喂料的流變學行為， 測定了該合金注射成形試樣的力學性能和燒結收縮率。結果表明：97W-2Ni-1Fe重合金喂料的流變行為可用假塑性體來描述， 產品的屈服強度達649 MPa， 斷裂強度達936 MPa， 延伸率11.4%，硬度為HRC31， 其力學性能優(yōu)于傳統(tǒng)壓制/燒結工藝產品， 且燒結收縮基本各向同性， 產品尺寸偏差范圍為±0.02 mm。
關鍵字: 關鍵詞: 金屬注射成形 W-Ni-Fe 重合金 流變性能
（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
