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時效制度對AA6156鋁合金拉伸性能和斷裂韌性的影響
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國家重點基礎(chǔ)研究發(fā)展規(guī)劃資助項目 (2005CB623705)


Effects of Aging Treatments on Tensile Properties and Fracture Toughness of AA6156 Aluminum Alloy
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    摘要:

    研究了AA6156鋁合金在不同時效狀態(tài)下的拉伸性能和平面應(yīng)力斷裂韌性。結(jié)果表明：AA6156合金薄板在自然時效態(tài)下斷裂韌性最好，但強(qiáng)度偏低；在190 ℃單級峰時效和175 ℃/6 h+190 ℃/13 h雙級過時效態(tài)下強(qiáng)度較好，但斷裂韌性偏低；而在175 ℃/2 h+200 ℃/0.5 h雙級時效態(tài)下達(dá)到較理想的強(qiáng)韌性匹配。由透射電鏡和掃描電鏡觀察其微觀組織及斷口形貌得出：雙級時效時，第一級預(yù)時效處理能增大GP區(qū)的析出數(shù)量，從而在后續(xù)第二級時效時極大地促進(jìn)β″相更密集、更均勻地析出。時效制度對AA6156合金斷裂韌性的影響主要取決于晶內(nèi)析出相β″，而受晶界微觀組織結(jié)構(gòu)的影響較小

    Abstract:

    The tensile properties and plane-stress fracture toughness of AA6156 aluminum alloy with different aging treatments were studied. The results show that the natural aged AA6156 alloy obtains perfect fracture toughness, while a lower strength. The AA6156 alloy in single peak aging at 175 oC and in 175 oC/6 h+190 oC/13 h duplex over aging can both offer preferable strength, while lower fracture toughness. The property of the alloy can achieve the superior combination of the strength and toughness under 175 oC/2 h+200 oC/0.5 h aging conditions. Microstructure observations indicate that pre-aged treatment can increase the quantity of GP-zones, thus promoting homogeneous precipitation of β″ phase in the following aging treatments. The effect of aging treatments on fracture toughness of AA6156 alloy mainly depends on the strengthening phase β″ in the matrix, whereas grain boundary microstructures have less effect on it

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鐘 警,鄭子樵,佘玲娟,李紅萍,吳秋萍.時效制度對AA6156鋁合金拉伸性能和斷裂韌性的影響[J].稀有金屬材料與工程,2013,42(10):2163~2168.[Zhong Jing, Zheng Ziqiao, She Lingjuan, Li Hongping, Wu Qiuping. Effects of Aging Treatments on Tensile Properties and Fracture Toughness of AA6156 Aluminum Alloy[J]. Rare Metal Materials and Engineering,2013,42(10):2163~2168.]
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  • 收稿日期:2012-09-28
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