Analysis on the behavior exceeding peak-aging strength of aluminum alloy at condition of RRA

Acta Metall Sin

2006, Vol. 42

Issue (12): 1253-1258 DOI:

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Analysis on the behavior exceeding peak-aging strength of aluminum alloy at condition of RRA

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中南大学材料科学与工程学院; 邵阳学院机械工程系

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. Analysis on the behavior exceeding peak-aging strength of aluminum alloy at condition of RRA. Acta Metall Sin, 2006, 42(12): 1253-1258 .

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Abstract The behavior exceeding peak-aging strength in the RRA condition of three different aluminum alloys has been studied.The results of hardness and tensile strength test indicate that after presaging at 100℃ or 120℃ and retrogressing at 200℃ for various time and reaging treatment,the hardness and strength of studied alloys are all above the value of presaging condition,some of them even exceed the value of peak aging(T6) condition .And the alloys exhibit a desired combination of strength and elongation after RRA treatment.TEM observation shown that the PFZs formed during retrogressing in short time become narrowed and even disappeared after reaging treatment.In this condition ,the precipiatates in the matrix are maily G.P zones and a few η’precipitates.However, the PFZs formed during retrogressing for a long time can not be narrowed after reaging treatment. In this condition ,the precipiatates in the matrix are coarsen.In T6 condition the precipitates has a uniform distribution with obvious characteristic of PFZs and the volume fraction of η’phase is somewhat increased.Corresponding EDS analysis indicates that the PFZs formed during retrogression are the depletion area of solute atoms.On one hand ,This area can be reduced and even eliminated after short time retrogression and reaging treatment.On the other hand ,this area can not be narrowed when retrogressed for long time and reaged. It is suggested that the behavior exceeding peak-aging strength in the RRA condition ascribes to the narrowing and even disappearing of PFZs formed during retrogression in the process of reaging treatment, which reinforces the grain-broundary, while the precipitates in the matrix of the alloys still keep or even exhibit a more dispersed distribution, and obtain a higher effect of precipitation strengthening.

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Received: 04 January 2006

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I12/1253

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