Retrogression and Reaging Treatment of Underaged Spray Forming 7075 luminum Alloy

Qu Yingdong; Su Ruiming; Tang Caiyu; Li Rongde; Xie Qiming; You Junhua

doi:10.15980/j.tzzz.2014.05.030

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Retrogression and Reaging Treatment of Underaged Spray Forming 7075 luminum Alloy
Vol. 34, Issue 5, Pages: 463-466(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.05.030

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[1]曲迎东,苏睿明,唐才宇,李荣德,解骐鸣,尤俊华.喷射成形7075铝合金欠时效回归再时效热处理[J].特种铸造及有色合金,2014,34(05):463-466.

Qu Yingdong, Su Ruiming, Tang Caiyu, et al. Retrogression and Reaging Treatment of Underaged Spray Forming 7075 luminum Alloy. [J]. Special Casting & Nonferrous Alloys 34(5):463-466(2014)
[1]曲迎东,苏睿明,唐才宇,李荣德,解骐鸣,尤俊华.喷射成形7075铝合金欠时效回归再时效热处理[J].特种铸造及有色合金,2014,34(05):463-466. DOI： 10.15980/j.tzzz.2014.05.030.

Qu Yingdong, Su Ruiming, Tang Caiyu, et al. Retrogression and Reaging Treatment of Underaged Spray Forming 7075 luminum Alloy. [J]. Special Casting & Nonferrous Alloys 34(5):463-466(2014) DOI： 10.15980/j.tzzz.2014.05.030.

摘要

采用透射电镜、拉伸测试等方法

研究欠时效回归再时效处理对喷射成形7075铝合金显微组织和力学性能的影响

并与单级峰值时效和常规回归再时效处理相比较。结果表明

采用120℃×12h欠时效预处理比120℃×24h峰值时效预处理更有利于在回归处理后合金晶内析出相的回溶

回归处理过程可使合金晶界析出相充分断开

再时效后晶内的析出相细小弥散

合金抗拉强度和屈服强度分别为776和723MPa

均高于T6峰值时效和常规回归再时效水平。

Abstract

Effects of retrogression and reaging（RRA）treatment on microstructure and mechanical properties of underaged spray forming 7075aluminum alloy were investigated by transmission electron microscope（TEM）and tensile testing

and compared with those of alloys under peak aging and conventional RRA treatment.The results show that underaging at 120℃for 12has preaging treatment is more beneficial for the re-dissolution of precipitates in matrix than peak aging（T6

120 ℃×24h）in retrogression treatment.By retrogression treatment

the precipitates on the grain boundary are disconnected completely.After reaging treatment

fine and dispersed precipitates can be observed in the grain.And the tensile strength and yield strength of the alloy reach 776MPa and 723MPa

respectively

which are higher than those in T6or conventional RRA treatment.