(北京有色金屬研究總院 有色金屬材料制備加工國家重點實驗室，
北京 100088)
摘 要: 采用噴射成形技術制備Al10.8Zn2.8Mg1.8Cu高強鋁合金， 利用力學性能測試、 高分辨透射電鏡(HREM)、 選區(qū)衍射(SAED)等手段系統(tǒng)研究120 ℃下該合金的時效曲線和沉淀析出行為。 研究結果表明： 該合金在120 ℃時效4 h強度即可達到800 MPa以上； 16 h達到峰時效狀態(tài)， 強度可達820 MPa， 此階段GPⅠ區(qū)和GPⅡ區(qū)聯(lián)合強化起主導作用； 44 h后存在長時間的時效平臺， 強度在800 MPa左右， 此階段η′相和η相起主導強化作用。
關鍵字: Al-Zn-Mg-Cu合金; 噴射成形; 沉淀析出; 力學性能
XIONG Bai-qing, SHI Li-kai
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: Al10.8Zn2.8Mg1.8Cu alloy was prepared by spray forming technology. The microstructural evolution and the age-hardening characteristic of spray-formed Al10.8Zn2.8Mg1.8Cu alloy were studied by high resolution transmission electron microscopy (HREM) and selected area electron diffraction (SAED). The results show that the peak ultimate tensile strength (UTS) can get up to 822 MPa at 120 ℃, and the corresponding time to reach this peak strength is 16 h, the microstructure of this stage contains predominantly the spherical GPⅠ zones and sheet GPⅡ zones. The UTS will decrease after peak aging treatment and then keep little change for a relative long time. After 44 h, the microstructure of this stage contains predominantly the η′ phase and the η phase.
Key words: Al-Zn-Mg-Cu alloy; spray forming; precipitate; mechanical property
