| Original Articles |
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Grain Boundary Peak in a Foamed Zn-Al Eutectoid Alloy |
| WEI Jian-Ning;CHENG He-Fa;GONG Chen-Li;ZHOU Zheng-Cun,
LI Zhi-Bin;HAN Fu-Sheng |
| Laboratory of Internal Friction and Defects in Solids,
Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 |
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| Cite this article: |
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WEI Jian-Ning, CHENG He-Fa, GONG Chen-Li et al 2002 Chin. Phys. Lett. 19 381-384 |
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Abstract We study experimentally the temperature spectra of internal friction (IF) and relative dynamic modulus (RDM) in a foamed Zn-Al eutectoid alloy. The specimens with macroscopic pores (0.5--1.0mm) were prepared in an air pressure infiltration process. The damping behaviour of the foamed Zn-Al eutectoid alloy is characterized by IF. The IF and RDM measurements at maximum surface shear strain of 20 x 10-6 have been made by using a multifunction internal friction apparatus at frequencies of 0.5, 1.0, and 3.0 Hz from room temperature to equilibrium eutectoid isotherm of 277°C, while continuously changing the temperature cycle. At low frequency, an IF peak is observed in the IF-temperature curve. The IF peak is of a grain boundary, which is associated with the diffusive flux on a crystalline boundary between the like-phases of Al/Al. Its activation energy has been calculated to be 1.10±0.06eV and the pre-exponential factor τ0 is 10-14s in the IF measurements.
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| Keywords:
62.40.+i
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Published: 01 March 2002
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| PACS: |
62.40.+i
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(Anelasticity, internal friction, stress relaxation, and mechanical resonances)
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