Processing, structure and properties of Ni-W alloys fabricated by mechanical alloying and hot-isostatic pressing
- Michigan Technological Univ., Houghton, MI (United States). Dept. of Metallurgical and Materials Engineering
The structure and properties of Ni-W alloys fabricated through MA and subsequent consolidation of the alloyed powders have been investigated. In comparatively W rich alloys, extensive solid solution of W in Ni accompanies MA and there is also evidence of partial or complete amorphization taking place during milling. During consolidation of these powders, W and an intermetallic (based on NiW) precipitate from the glassy matrix, which itself crystallizes. As-consolidated hardnesses of such materials are higher, by quite a bit, than the hardnesses of WHA formed via LPS. Structures obtained following consolidation remain nonequilibrium in that the W content of the matrix exceeds the equilibrium low temperature solubility and NiW is not stable at the post-consolidation heat-treatment temperature employed. This heat-treatment results in a gradual approach to the equilibrium structure and an increase in material microstructural scale. It is also accompanied by significant decreases in material hardnesses.
- Sponsoring Organization:
- Department of the Army, Washington, DC (United States)
- OSTI ID:
- 611567
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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