小角度X散射研究
(1. 北京有色金屬研究總院 有色金屬材料制備加工國家重點(diǎn)實(shí)驗(yàn)室, 北京 100088；
2. 鋼鐵研究總院 粉末冶金研究室，北京 100088；
3. 中國科學(xué)院 上海應(yīng)用物理研究所，上海 201204)
摘 要: 通過同步輻射小角度X散射實(shí)驗(yàn)方法(SAXS)、透射電鏡(TEM)和力學(xué)性能測試，研究Al-4.74Cu-0.50Mg-0.30Ag合金單級(jí)時(shí)效過程中的沉淀析出行為。結(jié)果表明：合金在單級(jí)時(shí)效過程中的主要析出相為Ω相和少量的θ ′相，隨著時(shí)效時(shí)間的延長，析出相的徑向尺寸明顯增大，寬度方向變化較小，逐漸演變成為薄片狀，析出相尺寸先增大后趨于穩(wěn)定，其體積分?jǐn)?shù)先增大后減小，最后再逐漸增大，且增大速率降低。
關(guān)鍵字: 鋁合金；小角度Ｘ散射；沉淀；體積分?jǐn)?shù)
Al-4.74Cu-0.50Mg-0.30Ag alloys during aging process
（1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. Department of Powder Metallurgy, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China）
Abstract:The precipitation behavior of Al-4.74Cu-0.50Mg-0.30Ag alloys during single aging process was studied by the synchrotron-radiation small angle X-ray scattering (SAXS), transmission electron microscopy analysis (TEM) and mechanical property test. The results show that the Ω phase and little θ ′ phases precipitate during single aging process, and with prolonging the aging time, the radial size of the precipitates increases notably, whereas the width of the precipitates increases little, therefore, the shape of the precipitates gradually changes into thin plates. The size of the precipitation increases at the beginning of aging process and goes to a stable value at last. The volume fraction of the precipitation increases at the beginning and then decreases, at last increases in a smaller rate.
Key words: aluminum alloys; small angle X-ray scattering; precipitation; volume fraction
