Co-W (Cobalt-Tungsten)
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Supplemental Literature Review: Section III
Co-W (Cobalt-Tungsten) H. Okamoto
The dotted line at 422 °C was added to indicate the aCo M eCo allotropic transformation.
The Co-W phase diagram in [Massalski2] was redrawn from [1986Nag]. [1999Zao] studied the (aCo)/(aCo) + Co3W phase boundary in detail and reported that the result was in agreement with [1986Nag] (see [2002Oka]). The effect of ferromagnetic transformation in (aCo) was observed only as a change of slope in the boundary. However, a thermodynamic calculation by [1989Gui] predicted the existence of a miscibility gap (Nishizawa horn) between paramagnetic and ferromagnetic (aCo). [2006Ost] confirmed the prediction by atom probe measurements. Figure 1 shows the Co-W phase diagrams calculated by [1989Gui] (>727 °C) and by [2006Ost] (
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