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Phase Separation and Stability of L21 Type Phase in Co2(Cr1 xFex)(Ga1 yAly) Alloys

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Fig. 2Selected area diffraction patterns (SADPs) with the specimen tiltedto the ½011�� matrix zone axis and the TEM dark-field images taken from(100)B2 or ð111ÞL21 reflection for the Co2Cr(Ga1�yAly) alloys with y ¼0:75 and 0.5 (a) y ¼ 0:75 annealed at 773 K for 48 h, (b) y ¼ 0:75 annealedat 1173 K for 15 min, (c) y ¼ 0:5 annealed at 873 K for 15 min.
Fig. 3Metastable phase diagrams of the bcc phase in the Co2Cr(Ga1�yAly) and Co2Fe(Ga1�yAly) alloy systems together with data on theCo2(Cr1�xFex)Al system.14) The bold hatched and dotted lines represent the transition temperature TB2=L2t1from the B2 to L21-type phaseand the Curie temperature Tc, respectively, determined by the DSC measurements and TEM observations.
Table 3The Curie temperature Tc, the transition temperature TB2=A2þB2tfrom the B2 to A2 þ B2-type phase and the transition temperatureTB2=L2t1from the B2 to L21-type phase of the Co2(Cr1�xFex)(Ga1�yAly)y alloy system.
Fig. 5Iso-polarization lines in the Co2(Cr1�xFex)(Ga1�yAly) alloy systemby linear interpolation from the theoretical results for Co2(Cr1�xFex)Aland Co2(Cr1�xFex)Ga alloys with the L21-type structure.11,18)

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