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In this study, the effects of cryogenic treatment cycles on the residual stress and mechanical properties of 7075 aluminum alloy (Al7075) samples, in the form of a tube-shaped product with a diameter of 500 nm, were investigated. Samples were first subjected to solution treatment at $470^{\circ}C$, followed by cryogenic treatment and aging treatment. The residual stress and mechanical properties of the samples were systematically characterized. Residual stress was measured with a cutting method using strain gauges attached on the surface of the samples; in addition, tensile strength and Vickers hardness tests were performed. The detailed microstructure of the samples was investigated by transmission electron microscopy. Results showed that samples with 85 % relief in residual stress and 8% increase in tensile strength were achieved after undergoing three cycles of cryogenic treatments; this is in contrast to the samples processed by conventional solution treatment and natural aging (T4). The major reasons for the smaller residual stress and relatively high tensile strength for the samples fabricated by cryogenic treatment are the formation of very small-sized precipitates and the relaxation of residual stress during the low temperature process in uphill quenching. In addition, samples subjected to three cycles of cryogenic treatment demonstrated much lower residual stress than, and similar tensile strength compared to, those samples subjected to one cycle of cryogenic treatment or artificial aging treatment.
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참고문헌 (17)
참고문헌 신청
권의표 / 2009 / 고압용기로 사용되는 후방압출된 알루미늄 6061합금의 기계적 특성에 미치는 용체화처리 및 시효처리의 영향 / 대한금속·재료학회지 47(3):175~181
H. S. Kim / 1978 / J. Kor. Inst. Met. & Mater. 16:233
P. Juijerm / 2006 / Scr. Mater. 55:1111
G. P. Dolan / 2004 / J. Mater. Process. Tech. 153-154:346
최세원 / 2012 / Al-Mg계 합금과 Al-Si계 합금의 다이캐스팅 응고과정의 차이 / 한국재료학회지 22(2):82~85
H. S. Kim / 1978 / J. Kor. Inst. Met. & Mater. 16:233
P. Juijerm / 2006 / Scr. Mater. 55:1111
G. P. Dolan / 2004 / J. Mater. Process. Tech. 153-154:346
최세원 / 2012 / Al-Mg계 합금과 Al-Si계 합금의 다이캐스팅 응고과정의 차이 / 한국재료학회지 22(2):82~85
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