Influence of Overaging on Fatigue Strength and Ultrasonic Parameters of Aluminum Alloy A2024-T3

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  • MIN Xiao-Hua
    Graduate student, Saitama University, now in Tokyo Institute of Technology
  • KATO Hiroshi
    Department of Mechanical Engineering, Faculty of Engineering, Saitama University
  • WATANABE Naoki
    Department of Mechanical Engineering, Faculty of Engineering, Saitama University
  • KAGEYAMA Kensuke
    Department of Mechanical Engineering, Faculty of Engineering, Saitama University

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Abstract

The aluminum alloy A2024-T3 was overaged at 573 K for different aging times, and then subjected to the hardness measurement and the fatigue testing. The hardness decreased successively with increasing aging time, but the fatigue life largely decreased to a half of the initial life after aging for 2 h or longer. The ultrasonic measurement was carried out with overaged specimens to examine changes in ultrasonic parameters with the aging time. The peak intensity (PI) gradually decreased with increasing aging time, but the average gradient of the transfer function (AGTF) largely decreased and became almost constant after aging for 2 h or longer. The ultrasonic measurement was also carried out in-process during the fatigue testing by using the water bag. The ultrasonic parameters (PI and AGTF) increased with the number of fatigue cycles (N) with considerable scatter, and the average rate of AGTF in the fatigue process (d(AGTF)/dN) increased with the aging time up to 4 h.

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