Fine-Grained W-Ni-Fe Heavy Alloys Prepared by Spark Plasma Sintering

Abstract:

Fine-grained W-Ni-Fe heavy alloys (WHAs) with grain size of about 1-3μm were obtained by Spark Plasma Sintering (SPS) process. The composition of the alloy is consisted of 65 to 75 wt % W, with a Ni/Fe ratio ranging from zero to 7/3. In the lower sintering temperature range of 1100-1300°C, the WHAs showed the highest relative density of 98.6%, and when the sintering temperature was 1250 °C, the relative density of the WHAs prepared by the same techniques increased by decreasing of the content of W. Meanwhile the relative density of the alloy also increased with an increase of Ni /Fe ratio. The results show that the static tensile properties of the WHAs have a close relationship with the ratio of Ni / Fe. The tensile strength and the ductility of the sample W70-Ni21-Fe9 was 890 MPa and 3%. Furthermore, the dynamic compression strength of W70-Ni21-Fe9 was 1744 MPa.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 745-752
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.745
• Online since: March 2016
• Authors: Yan Jiao Wu, Yun Kai Li, Dong Hui Yu
• Keywords: Heavy Alloys, Mechanical Properties, Spark Plasma Sintering, W-Ni-Fe Alloys

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