(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 通過硬度試驗(yàn)、拉伸試驗(yàn)、掃描電鏡以及透射電鏡研究斷續(xù)時(shí)效對(duì)2519A鋁合金板材微觀組織和力學(xué)性能的影響。研究表明：2519A鋁合金經(jīng)斷續(xù)時(shí)效(T9I6)后，其屈服強(qiáng)度、抗拉強(qiáng)度和伸長率分別為501 MPa、540 MPa和14%，相比于2519A-T87狀態(tài)鋁合金的450 MPa、480 MPa和9%，分別提高了51 MPa、60 MPa和5%。在斷續(xù)時(shí)效過程中，低溫保溫可以使基體內(nèi)不斷形成大量臨界尺寸的密集、細(xì)小的GP區(qū)，而使時(shí)效相也趨于細(xì)小、密集，從而提高了合金的力學(xué)性能。
關(guān)鍵字: 2519A鋁合金；斷續(xù)時(shí)效；組織；力學(xué)性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metals Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The effect of interrupted ageing on the microstructure and mechanical properties of 2519A aluminum alloy was studied by means of hardness, tensile test, SEM and TEM. After the T9I6 heat treatment, the yield strength, tensile strength and elongation of 2519A aluminum alloy can reach 501 MPa, 540 MPa and 14%, respectively. Compared to T87 temper, which is 450 MPa, 480 MPa and 9%, respectively, the mechanical properties of 2519A-T9I6 increases by 51 MPa, 60 MPa and 5%, respectively. During the process of interrupted aging, keeping the alloy in a lower temperature contributes to forming the numerous, finer and denser GP zone with critical size. So, the following precipitated phase will also be finer and denser, which results in the increasing mechanical properties of 2519A aluminum alloy.
Key words: 2519A aluminum alloy; interrupted ageing; microstructure; mechanical properties
