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Precipitate Evolution in Mg-6 wt%Zn-1 wt%Mn Alloy
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Precipitate Evolution in Mg-6 wt%Zn-1 wt%Mn Alloy
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National Great Theoretic Research Project (2007CB613700); National Sci & Tech Support Project (2011BAE22B03-3); International Cooperation Project (2010DFR50010, 2008DFR50040); Chongqing Sci & Tech Project (CSTC, 2010AA4048)

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    摘要:

    通過透射電子顯微技術(shù)（TEM）研究了Mg-6 wt%Zn-1 wt%Mn (ZM61)合金在單級(jí)和雙級(jí)時(shí)效過程中過渡相β1'和β2'的演變規(guī)律以及β1'桿狀相在α-Mn顆粒上異質(zhì)形核的原因。ZM61合金在不同溫度的硬化曲線（130、160、180、200、230 ℃）均表明：與單級(jí)時(shí)效相比，雙級(jí)時(shí)效的硬化效果更好同時(shí)硬化速率更快。由于β1'桿狀相的表面能和形核能壘均小于β2'盤狀相，因此，峰時(shí)效之前主要發(fā)生β1'桿狀相的快速形核和伸長；β1'桿狀相體積分?jǐn)?shù)的增加在帶來硬度增加的同時(shí)也提升了體系的應(yīng)變能，β2'盤狀相取代β1'桿狀相可以釋放這一累積的應(yīng)變能，因而過時(shí)效階段主要發(fā)生β2'盤狀相對(duì)β1'桿狀相的逐步取代。ZM61合金在預(yù)時(shí)效后（90 ℃/24 h），組織中存在高彌散度的G. P. 區(qū)（~10 nm），它們可以作為第二級(jí)時(shí)效過程中β1'桿狀相的形核核心，從而大幅提升了桿狀相的彌散度。由于β1'桿狀相在α-Mn顆粒上異質(zhì)形核可以形成β1'/α-Mn共格界面，取代之前的非共格的α-Mn/α-Mg界面，從而有效降低了體系的界面能，因此時(shí)效態(tài)組織中普遍存在β1'桿狀相在α-Mn顆粒上異質(zhì)形核的現(xiàn)象

    Abstract:

    The evolution rules of transitional phases β1' and β2' during single and double aging and the heterogeneous nucleation of β1' rods on α-Mn particles in a Mg-6 wt%Zn-1wt%Mn (ZM61) alloy were studied by TEM technique. Age-hardening curves (130, 160, 180, 200 and 230 °C) show that double aging can more greatly enhance hardening level and rate than single aging. The rapid nucleation and the elongation of β1' rods occupies the stage before peak aging; the volume fraction increase of β1' rods results in hardness rise and also a huge accumulation of strain energy; in the over-aging stage the growth of β2' discs at the cost of β1' rods can effectively relieve such a strain energy accumulation. G. P. zones of about 10 nm in diameter are densely distributed in matrix after the pre-aging (90 °C/24 h), which can act as the heterogeneous nuclei for β1' rods and thus considerably raise their number density. Moreover, β1' rods frequently heterogeneously nucleate on α-Mn particles, because such heterogeneous nucleation can result in a coherent β1'/α-Mn interface and thus reduce the interfacial energy

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石國梁,張丁非,趙霞兵,張 奎,李興剛,李永軍,馬鳴龍. Precipitate Evolution in Mg-6 wt%Zn-1 wt%Mn Alloy[J].稀有金屬材料與工程,2013,42(12):2447~2452.[Shi Guoliang, Zhang Dingfei, Zhao Xiabing, Zhang Kui, Li Xinggang, Li Yongjun, Ma Minglong. Precipitate Evolution in Mg-6 wt%Zn-1 wt%Mn Alloy[J]. Rare Metal Materials and Engineering,2013,42(12):2447~2452.]
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  • 收稿日期:2012-12-19
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