【摘要】：采用硬度、電導率、力學拉伸、慢應變速率拉伸試驗及透射電鏡等測試分析方法,研究雙級時效對7085鋁合金組織和性能的影響。結(jié)果表明:預時效熱處理主要析出相為GP區(qū)和η′相,預時效時間對合金硬度和電導率的影響較小。隨著第二級時效時間的延長,合金的抗拉強度和屈服強度先增大后減小,電導率和抗應力腐蝕性能提高,晶界析出相由連續(xù)分布變?yōu)榉沁B續(xù)分布。第二級時效溫度越高,合金強度隨時效時間的延長,降低得越顯著。采用(110℃,6 h)+(160℃,12 h)雙級時效熱處理,合金的抗拉強度、屈服強度、伸長率及電導率分別為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