A Study of Internal Friction, Electric Resistance and Shape Change in Cu-Zn and Cu-Zn-Al Alloys During Phase Transformation Use Simultaneous Measurement Method
The internal friction (Q-1), electric resistance (r), shape change (X), and temperature (T) in TiNi alloys during phase transformation have been measured simultaneously . A. Ghilarducci and, M. Ahlers  have studied the internal friction in Cu-Zn and Cu-Zn-Al alloys and have shown that the Q-1 peaks are not due to the phase transformation but due to point defects. The electric resistance during thermoelastic martensite (TEM) phase transformation has been studied by K. Otsuka, et.al,  and I. Cornelis and, C. M. Wayman showed that the TEM phase transformation temperature Ms, Mf, As and Af can be obtained from the electric resistance R vs. temperature T curves (R-T curve) . The quantitative relation between the electric resistance change and the amount of martensite is not yet known. Now, the Q-1, R, X, frequency f and T during TEM transformation in Cu-Zn and Cu-Zn-Al alloys have been measured simultaneously as has been done in a TiNi alloy [1,5]. The amount of martensite at every temperature from Ms to Mf and As to Af was calculated by Delorme’s formula of internal friction , so that the change of R can be calculated.
KeywordsPhase Transformation Phase Boundary Internal Friction Shape Change Nondestructive Evaluation
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