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자료유형
학술저널
저자정보
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.6
발행연도
2021.1
수록면
1,428 - 1,437 (10page)

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초록· 키워드

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The heat treatable aluminium alloy AA2219 is subjected to mechanical stress relieving by way of cold deformation aftersolution treatment to relieve the quenched in stresses as thermal stress relieving is not possible due to the requirement ofhigher temperature than the ageing temperature. Cold deformation prior to aging has also been found to yield improvedstrength. Though this phenomenon is to some extent being exploited in aluminium alloy AA2219 sheets and plates, thereis no experimental data available to understand the influence of cold compression on the extent of benefits obtainable onmechanical properties in forgings. In the present study to identify a thermo-mechanical treatment that can yield the maximumtensile strength, solution treated AA2219 forgings were subjected to cold deformation ranging from 0 to 25% and thenartificially aged. The results indicates that the maximum room temperature tensile strength (both UTS and 0.2% PS) can beobtained at 10% post solution treatment cold deformation. As this alloy is being used for low temperature applications, it isvery essential to assess the effect of higher cold compression on the low temperature (77 K) properties and the results showthat the 77 K tensile properties more or less same beyond 2% cold deformation. As the weld properties are around 50% ofthe parent metal properties, any increase in the mechanical properties, is considered to be very crucial and very much neededfor this alloy in the absence of aluminium–lithium alloy technology. Hence this study indicate that there is a good scopeto increase the amount of cold compression after Solution treatment instead of restricting the same to 2%–5% maximum.

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