(1. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國家重點(diǎn)實(shí)驗(yàn)室，蘭州 730050；
2. 蘭州理工大學(xué) 有色金屬合金省部共建教育部重點(diǎn)實(shí)驗(yàn)室，蘭州 730050)
摘 要: 采用光學(xué)顯微鏡(OM)、掃描電鏡(SEM)、X射線衍射儀(XRD)等，研究熱處理對流變壓鑄2024變形鋁合金組織及性能的影響。結(jié)果表明：流變壓鑄成形的2024變形鋁合金在495 ℃固溶處理12 h后，共晶相θ(CuAl2)相和S(CuAl2Mg)相在α(Al)基體中充分固溶，初生顆粒與二次凝固區(qū)顆粒也存在合并長大現(xiàn)象；經(jīng)190 ℃時(shí)效處理8 h后，合金強(qiáng)度較高；時(shí)效處理16 h時(shí)，合金硬度達(dá)到峰值，合金析出相主要在晶界以不連續(xù)析出為主，合金具有較好的固溶強(qiáng)化作用。
關(guān)鍵字: 2024變形鋁合金；半固態(tài)；流變壓鑄；熱處理
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology,
Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou University of Technology,
Lanzhou 730050, China）
Abstract:The effects of heat treatment on the microstructure and mechanical properties of 2024 wrought aluminum alloy produced by rheo-diecasting (RDC) were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffractometry (XRD), and so on. The results show that when the RDC 2024 wrought aluminum is solution-treated at 495 ℃ for 12 h, the eutectic θ(CuAl2) phase and S(CuAl2Mg) phase are gradually solution-treated into the α(Al) matrix, and the primary particles and the secondary solidification particles grow. The excellent mechanical properties of alloy are obtained as aging treated at 190℃ for 8 h, and the peak value of harness is obtained when the aging time is 16 h. The discontinuous precipitation mainly distributes at the grain boundaries, and the alloy has the excellent solution strengthening property.
Key words: 2024 wrought aluminum alloy; semi-solid; rheo-diecasting; heat treatment
