| Title |
Variation of Microstructure and Mechanical properties with Binder Compositions in W - Ni - Fe heavy Alloy |
| Authors |
김은표(Eun Pyo Kim); 이성(Seong Lee); 송흥섭(Heung Sub Song); 노준웅(Joon Woong Noh); 백운형(Woon Hyung Baek); 천길성(Kil Sung Churn) |
| Abstract |
W heavy alloys with different composition of matrix were sintered at various temperatures to investigate the microstructure and mechanical properties. The Ni/Fe ratios in the composition of 93W-7 (Ni-Fe) heavy alloys were varied from 7/3 via 8/2 to 9/1 by weight. The results showed that, with increased in Ni contents, the volume fraction of matrix was increased due to increased solubility of W in the matrix. In trun, it lowered dihedral angle and facilitated matrix peneratration along the grains to lower contiguity. The increased volume fraction of ductile matrix and decreased contiguity contributed to a higher ductility and toughness. The specimen with 9/1 of Ni/Fe ratio showed the lowest impact energy even though it had the largest volume fraction of matrix and the lowest contiguity. This was attributed to the highly dissolved W in the matrix. The optimum composition in the matrix is 80% Ni and 20Fe. |