| Effects of alloy composition on the transformation temperatures in Cu -14.5Zn-8.7Al, Cu-l4.1Zn-8.5Al, Cu-13.7Zn-8.2Al shape memory alloys were studied. The phase stability of electron compounds of β phase in Cu-Zn-Al shape memory alloys was analyzed in terms of electron concentration followed by Hume-Rothery theory. Orderning temperature TB2 and TDO3 were calculated using the formulae by Inden. It was founded that TB2 was relatively insensitive to concentration of Zn or Al, but TDO3 was founded to be greatly reduced with the increased Zn concentration (above about 10 atomic % Zn). Ms temperature of the SME alloys were found to be very sensitive to the Zn, Al concentration. The Ms temperatures of Cu-14.5Zn-8.7Al, Cu-14.1Zn-8.5Al, Cu-13.7Zn-8.2Al were found to be -120, -10, +120℃, respectively. |
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