(大連理工大學(xué) 三束材料改性國家重點實驗室 材料科學(xué)與工程學(xué)院,大連 116024)
摘 要: 采用差示掃描量熱儀分析并結(jié)合顯微硬度測試、電子探針分析、透射電鏡觀察研究了10-T穩(wěn)恒強(qiáng)磁場對Al-4%Cu(質(zhì)量分?jǐn)?shù))合金130 ℃時效過程中各沉淀相析出行為的影響。結(jié)果表明：在低溫時效初期強(qiáng)磁場的引入加速了銅的擴(kuò)散，降低了G.P.(Ⅰ)區(qū)的溶解激活能，促進(jìn)其溶解，各沉淀相的析出與溶解溫度均向低溫處移動，時效進(jìn)程加快；另外，強(qiáng)磁場時效后沉淀相尺寸減小；施加強(qiáng)磁場試樣的硬度明顯高于未施加磁場試樣的，時效硬化效果加強(qiáng)。
關(guān)鍵字: Al-Cu合金；強(qiáng)磁場；時效行為；沉淀相
（State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China）
Abstract:The effects of 10-T magnetic field on ageing behavior of the precipitated phases of Al-4%Cu alloys aged at 130 ℃ were investigated by differential scanning calorimetry analysis, Vickers micro-hardness test, electron probe microanalysis and transmission electron microscopy observation. The results show that high magnetic field improves the diffusion of Cu atom, lowers the solution active energy of G.P.(Ⅰ) zone, speeds its solution and shifts the precipitated and dissolved temperature of the phases to lower points, thus accelerates the ageing course during the early stage at low temperature. Furthermore the high magnetic field reduces the dimension of the phases. The microhardness of the field-treated specimen is always higher than those of the non-field ones that indicates the high magnetic field strengthens the hardening effect.
Key words: Al-Cu alloys; high magnetic field; ageing behavior; precipitated phases
