發(fā)布時(shí)間：2019-04-28 07:30

【摘要】：采用硬度、電導(dǎo)率、力學(xué)拉伸、慢應(yīng)變速率拉伸試驗(yàn)及透射電鏡等測試分析方法,研究雙級時(shí)效對7085鋁合金組織和性能的影響。結(jié)果表明:預(yù)時(shí)效熱處理主要析出相為GP區(qū)和η′相,預(yù)時(shí)效時(shí)間對合金硬度和電導(dǎo)率的影響較小。隨著第二級時(shí)效時(shí)間的延長,合金的抗拉強(qiáng)度和屈服強(qiáng)度先增大后減小,電導(dǎo)率和抗應(yīng)力腐蝕性能提高,晶界析出相由連續(xù)分布變?yōu)榉沁B續(xù)分布。第二級時(shí)效溫度越高,合金強(qiáng)度隨時(shí)效時(shí)間的延長,降低得越顯著。采用(110℃,6 h)+(160℃,12 h)雙級時(shí)效熱處理,合金的抗拉強(qiáng)度、屈服強(qiáng)度、伸長率及電導(dǎo)率分別為515MPa、487MPa、11.7%、38%(IACS)。
[Abstract]:The effects of two-stage aging on the microstructure and properties of 7085 aluminum alloy were studied by means of hardness, conductivity, mechanical tensile test, slow strain rate tensile test and transmission electron microscope (TEM). The results show that the main precipitates in pre-aging heat treatment are GP region and 畏 'phase, and the effect of pre-aging time on hardness and conductivity of the alloy is small. With the prolongation of the second-order aging time, the tensile strength and yield strength of the alloy first increase and then decrease, the conductivity and stress corrosion resistance of the alloy increase, and the grain boundary precipitates change from continuous distribution to discontinuous distribution. The higher the aging temperature of the second order is, the more obvious the strength of the alloy decreases with the prolongation of aging time. The tensile strength, yield strength, elongation and electrical conductivity of the alloy were 515 MPA, 487 MPA, 11.7%, 38% (IACS)., respectively, after two-stage aging treatment (110 鈩，

本文編號：2467440