Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

The internal friction (Q-1), electric resistance (r), shape change (X), and temperature (T) in TiNi alloys during phase transformation have been measured simultaneously [1]. A. Ghilarducci and, M. Ahlers [2] 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, [3] and I. Cornelis and, C. M. Wayman showed that the TEM phase transformation temperature Ms, Mf, Asand Af can be obtained from the electric resistance R vs. temperature T curves (R-T curve) [4]. 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 [6], so that the change of R can be calculated.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9B

Chapter

Chapter 8: Characterization of Materials

Section

Properties

Pages

1611-1616

DOI

10.1007/978-1-4684-5772-8_207

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

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

Brunswick, ME

The internal friction (Q-1), electric resistance (r), shape change (X), and temperature (T) in TiNi alloys during phase transformation have been measured simultaneously [1]. A. Ghilarducci and, M. Ahlers [2] 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, [3] and I. Cornelis and, C. M. Wayman showed that the TEM phase transformation temperature Ms, Mf, Asand Af can be obtained from the electric resistance R vs. temperature T curves (R-T curve) [4]. 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 [6], so that the change of R can be calculated.