Temperature and dwell time effect on hardness of Al-base alloys |
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| Authors: | F. Abd El-Salam L. A. Wahab R. H. Nada H. Y. Zahran |
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| Affiliation: | (1) Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt;(2) National Centre for Radiation Research and Technology, Nasr-City, Cairo, Egypt |
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| Abstract: | The hardness of Al–5wt%Zn (alloy A) and Al–5wt%Zn–0.25wt%In (alloy B) was measured at room temperature for samples heat treated in the range 300–453 K and dwell times in the range 30–300 s under 50 gm load. Softening was observed for all the samples and the hardness decreased with increasing temperature and/or dwell time. Hardness drop was larger for alloy (B), which in general showed higher hardness than alloy (A). The stress exponent n increased with increasing temperature and showed high values falling in the power law breakdown region. The parameters deduced from the analysis of X-rays data and micrographs were found to be consistant with the calculated mechanical data. |
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