(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；2. 中南大學(xué) 有色金屬材料與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 采用硬度、電導(dǎo)率、室溫拉伸測(cè)試、差示掃描量熱分析(DSC)、極化曲線及透射電鏡(TEM)觀察研究預(yù)時(shí)效溫度及回歸加熱速率對(duì)7150鋁合金顯微組織及性能的影響。結(jié)果表明：合金的抗拉強(qiáng)度對(duì)預(yù)時(shí)效溫度敏感，耐腐蝕性能對(duì)回歸加熱速率敏感。再時(shí)效后合金的抗拉強(qiáng)度隨預(yù)時(shí)效溫度的升高而增加，耐腐蝕性能隨回歸加熱速率的提高而降低。經(jīng)(65 ℃，24 h)+(4.25 ℃/min)(190 ℃，50 min)+(120 ℃，24 h)的三級(jí)時(shí)效處理后，7150 鋁合金的電導(dǎo)率(IACS)大于36%，抗拉強(qiáng)度損失小于峰時(shí)效態(tài)(T6)合金強(qiáng)度的3%。
關(guān)鍵字: 7150鋁合金；回歸；預(yù)時(shí)效溫度；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,Central South University, Changsha 410083, China）
Abstract:Hardness, electrical conductivity, room temperature tensile properties testing, differential scanning calorimetry (DSC), polarization curve and transmission electron microscope (TEM) observation were used to investigate the effect of pre-aging temperature and retrogression heating rate on the microstructure and properties of 7150 aluminum alloy. The results reveal that the tensile strength is sensitive to the pre-ageing temperature, while the corrosion resistance is sensitive to the retrogression heating rate. The tensile strength of the re-aging treated alloy increases with the rise of pre-aging temperature, and the corrosion resistance deteriorates with the increase of retrogression heating rate. After (65 ℃, 24 h)+(4.25 ℃/min)(190 ℃, 50 min)+(120 ℃, 24 h) aging treatment，the electrical conductivity (IACS) of the 7150 aluminum alloy exceeds 36%, and the reduction of ultimate strength is less than 3% of the strength of T6 treatment alloy.
Key words: 7150 aluminum alloy; retrogression; pre-aging temperature; mechanical properties
