Abstract
The structure of martensite in CoW alloys containing 5.2–9.6wt.%W was analysed using high resolution electron microscopy. As-quenched alloys contain only a small fraction of martensite as Ms (the temperature at which the transformation of austenite to martensite starts during cooling) is lowered with increasing tungsten content. Martensite needles are built from a narrow layer of 2H martensite, separated by random stacking faults or several atomic layers of f.c.c. structure. A high density of dislocations changes additionally the stacking fault arrangement. Aging at 600 °C causes the formation of narrow Co3W precipitates, 4H layers and possibly other multilayer structures.
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