中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
3期
645-651
,共7页
宋丰轩%张新明%刘胜胆%韩念梅%花隆
宋豐軒%張新明%劉勝膽%韓唸梅%花隆
송봉헌%장신명%류성담%한념매%화륭
7050铝合金%预拉伸%时效%腐蚀性能
7050鋁閤金%預拉伸%時效%腐蝕性能
7050려합금%예랍신%시효%부식성능
7050 aluminum alloy%pre-stretching%aging%corrosion resistance
采用硬度、腐蚀速率、剥落腐蚀、慢应变速率拉伸测试及透射电镜和差示扫描量热法研究预拉伸后时效制度对7050铝合金板材显微组织、硬度和抗腐蚀性能的影响.结果表明:峰时效合金硬度最大,抗腐蚀性能最差;过时效和回归再时效与峰时效相比,合金的硬度值减小,抗腐蚀性能变好;在高温+峰时效中的高温时效阶段,GP区发生回溶,有利于η′和η相的直接形核析出,晶内析出相长大、不均匀分布,合金硬度减小;晶界析出相粗化、断续分布,合金抗腐蚀性能提高.
採用硬度、腐蝕速率、剝落腐蝕、慢應變速率拉伸測試及透射電鏡和差示掃描量熱法研究預拉伸後時效製度對7050鋁閤金闆材顯微組織、硬度和抗腐蝕性能的影響.結果錶明:峰時效閤金硬度最大,抗腐蝕性能最差;過時效和迴歸再時效與峰時效相比,閤金的硬度值減小,抗腐蝕性能變好;在高溫+峰時效中的高溫時效階段,GP區髮生迴溶,有利于η′和η相的直接形覈析齣,晶內析齣相長大、不均勻分佈,閤金硬度減小;晶界析齣相粗化、斷續分佈,閤金抗腐蝕性能提高.
채용경도、부식속솔、박락부식、만응변속솔랍신측시급투사전경화차시소묘량열법연구예랍신후시효제도대7050려합금판재현미조직、경도화항부식성능적영향.결과표명:봉시효합금경도최대,항부식성능최차;과시효화회귀재시효여봉시효상비,합금적경도치감소,항부식성능변호;재고온+봉시효중적고온시효계단,GP구발생회용,유리우η′화η상적직접형핵석출,정내석출상장대、불균균분포,합금경도감소;정계석출상조화、단속분포,합금항부식성능제고.
@@@@The effects of aging after pre-stretching process on microstructure, hardness, and corrosion resistance of the 7050 aluminum alloy plate were investigated by means of hardness tests, corrosion rate tests, exfoliation corrosion tests, slow strain rate tensile(SSRT) tests, transmission electron microscopy and differential scanning calorimetry(DSC). The results indicate that the peak-aged 7050 aluminum alloy possesses the highest hardness, but its corrosion resistance is poor. The overaging and the retrogression and re-aging treatments lower the hardness, but improve the corrosion resistance of the 7050 aluminum alloy compared with the peak-aging treatment. At the high temperature aging stage of the high temperature and a subsequent low temperature aging, GP zone can be reversed, which is beneficial to the nucleation of η′ and η phases. Consequently, the precipitates within grains become coarser and distribute uniformly, leading to the decrease of hardness. Meanwhile, the precipitates at grain boundaries become coarser and discontinuous resulting in an improved corrosion resistance.