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Mg-8Zn-1Cu-0.2Cr-0.5Ce-0.5Sb合金時(shí)效微觀組織
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國(guó)家自然科學(xué)基金項(xiàng)目 (51141007)；河北省自然科學(xué)基金項(xiàng)目 (E2010001398)


Microstructure of Aging Mg-8Zn-1Cu Magnesium Alloy with Cr, Ce and Sb Compound Addition
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    摘要:

    利用HRTEM研究了復(fù)合添加Cr、Ce和Sb的Mg-8Zn-1Cu合金的時(shí)效微觀組織。結(jié)果表明：在160 ℃經(jīng)8 h時(shí)效的實(shí)驗(yàn)合金時(shí)效初期存在較高的硬化速率，其微觀組織中存在層錯(cuò)和位錯(cuò)等缺陷，Moiré條紋，與基體共格且無(wú)明顯邊界的短桿狀預(yù)沉淀相和在三叉晶界交合處析出的沉淀相；經(jīng)20 h時(shí)效處理后達(dá)到峰值硬度945 MPa，其微觀組織中存在大量短桿狀-MgZn2相，塊狀-MgZn2相和粒狀沉淀相；經(jīng)48 h時(shí)效處理后，其微觀組織中存在大量沿[0001]α方向生長(zhǎng)的長(zhǎng)條狀沉淀相和彌散分布的粒狀沉淀相，與Mg-8Zn-1Cu合金相比長(zhǎng)條狀沉淀相的尺寸明顯減小

    Abstract:

    The microstructure of aging Mg-8Zn-1Cu magnesium alloy with Cr, Ce and Sb compound addition was studied by HRTEM. The results show that the hardening rate of the aging Mg-8Zn-1Cu-0.2Cr-0.5Ce-0.5Sb alloy is relatively high in the initial stage of the aging. For the alloy aged at 160 ℃ for 8 h, a number of stacking faults, dislocations and moiré fringe come into existence, and the short rod-shaped pre-precipitates in the grains and the precipitates in the trigeminal grain boundaries are simultaneously formed. For the alloy aged at 160 ℃ for 20 h, its peak hardness reaches 945 MPa and the alloy consists of a large number of short rod-shaped -MgZn2 precipitates, blocky -MgZn2 precipitates and granular precipitates. When the alloy is aged at 160 ℃ for 48 h, it consists of a large number of elongated precipitates and granular precipitates. The elongated precipitates are formed perpendicularly to the basal plane of magnesium. Compared to the Mg-8Zn-1Cu alloy, the sizes of elongated precipitates become much smaller

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董 允,林小娉,葉 杰,何 娜,王 麗,崔保軍. Mg-8Zn-1Cu-0.2Cr-0.5Ce-0.5Sb合金時(shí)效微觀組織[J].稀有金屬材料與工程,2013,42(12):2472~2476.[Dong Yun, Lin Xiaoping, Ye Jie, He Na, Wang Li, Cui Baojun. Microstructure of Aging Mg-8Zn-1Cu Magnesium Alloy with Cr, Ce and Sb Compound Addition[J]. Rare Metal Materials and Engineering,2013,42(12):2472~2476.]
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  • 收稿日期:2012-12-24
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