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欠時(shí)效態(tài)7150合金的高溫回歸時(shí)效行為
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時(shí)間：2015-10-27
通過(guò)維氏硬度、電導(dǎo)率及拉伸性能測(cè)試和TEM觀察研究欠時(shí)效狀態(tài)7150合金的高溫回歸時(shí)效行為。
欠時(shí)效態(tài)7150合金的高溫回歸時(shí)效行為High-temperature retrogression behavior of?under-aged 7150 aluminum alloy
通過(guò)維氏硬度、電導(dǎo)率及拉伸性能測(cè)試和TEM觀察研究欠時(shí)效狀態(tài)7150合金的高溫回歸時(shí)效行為。結(jié)果表明：回歸過(guò)程對(duì)合金的硬度和電導(dǎo)率影響顯著。隨著回歸溫度的提高，回歸曲線上的谷值點(diǎn)變低，達(dá)到谷值點(diǎn)所需的時(shí)間變短；在190 ℃回歸超過(guò)30 min后，晶界析出相明顯粗化，并且斷開；經(jīng)過(guò)(110 ℃，16 h)+(190 ℃，120 min)+(120 ℃，24 h)的三級(jí)時(shí)效處理后，合金的抗拉強(qiáng)度為595 MPa，屈服強(qiáng)度為565 MPa，伸長(zhǎng)率為12.5%，電導(dǎo)率為21.9 MS/m。采用此三級(jí)時(shí)效制度，合金的電導(dǎo)率較高，強(qiáng)度損失較小。此三級(jí)時(shí)效處理具有較長(zhǎng)的第二級(jí)高溫時(shí)效時(shí)間，適宜工業(yè)化操作。
The Vickers hardness, electrical conductivity, tensile properties testing and TEM were used to investigate the high-temperature retrogression behavior of under-aged 7150 aluminum alloy. The results indicate that the hardness and electrical conductivity are strongly influenced by retrogression process. The valley values of retrogression curves become lower and the time to reach the valley values becomes shorter with the increase of retrogression aging temperature. After retrogression at 190 ℃ for 30 min, the precipitates on the grain boundaries become coarse and are sparsely distributed. After (110 ℃, 16 h)+(190 ℃, 120 min)+(120 ℃, 24 h) aging treatment, the ultimate strength, yield strength, elongation and electrical conductivity of the alloy are 595 MPa, 565 MPa, 12.5% and 21.9 MS/m, respectively. The electrical conductivity of the alloy can be increased with less reduction in strength by this triple step aging treatment. This triple aging treatment is suitable for industry because of a relative long time of the second step aging.
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