【摘要】：通過對峰時(shí)效與T7951二次時(shí)效7055鋁合金力學(xué)性能測試、微觀組織與斷口分析,研究了顯微組織、基體析出相、晶界析出相與晶界無沉淀析出帶對材料強(qiáng)度與斷裂韌性的影響,并分析了斷裂機(jī)理。研究表明T7951二次時(shí)效產(chǎn)生的位錯(cuò)強(qiáng)化、細(xì)晶強(qiáng)化效應(yīng)與基體內(nèi)出現(xiàn)平衡η相導(dǎo)致的弱化作用之間的競爭機(jī)制導(dǎo)致材料強(qiáng)度較峰時(shí)效損失不大;晶界析出相的團(tuán)聚粗化是造成二次時(shí)效7055鋁合金斷裂韌性提高的主因;7055鋁合金室溫拉伸斷口表明斷裂機(jī)理為韌脆混合型斷裂,二次時(shí)效較峰時(shí)效表現(xiàn)出更強(qiáng)的韌性斷裂特征。
[Abstract]:The effects of microstructures, matrix precipitates, grain boundary precipitates and grain boundary precipitates on the strength and fracture toughness of 7055 aluminum alloy with peak aging and T7951 secondary aging were studied. The fracture mechanism is also analyzed. The results show that the competition mechanism between the dislocation strengthening, the fine grain strengthening effect and the weakening effect caused by equilibrium 畏 phase in the matrix makes the strength of T7951 less than that of the peak aging. The agglomeration coarsening of precipitated phase at grain boundary is the main reason for the increase of fracture toughness of 7055 aluminum alloy after secondary aging. The tensile fracture at room temperature indicates that the fracture mechanism is ductile-brittle mixed fracture, and the secondary aging shows a stronger ductile fracture characteristic than peak aging.
【作者單位】： 沈陽航空航天大學(xué)機(jī)電工程學(xué)院;沈陽航空航天大學(xué)航空制造工藝數(shù)字化國防重點(diǎn)學(xué)科實(shí)驗(yàn)室;
【基金】：遼寧省自然科學(xué)聯(lián)合基金(2013024012)
【分類號】：TG146.21;TG166.3
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本文編號：2170926