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水冷對普通鑄造Mg-Zn-Zr-Y鎂合金準(zhǔn)晶相形成的影響及鑄態(tài)組織研究
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國家“十二五”支撐計(jì)劃 (2011BAE22B03-3);科技部國際合作項(xiàng)目 (2011DFA5090);重慶市科技攻關(guān)項(xiàng)目 (CTSC-2010AA4045);重慶市自然科學(xué)基金 (CSTS-2010BB4068)


Effects of Water-Cooling on Quasicrystal Formation of As-Cast Mg-Zn-Zr-Y Alloys and the Microstructure
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    摘要:

    通過普通凝固方法,在鑄錠冷卻過程中進(jìn)行水冷制備準(zhǔn)晶強(qiáng)化Mg-Zn-Zr-Y鎂合金,并研究不同Zn和Y含量(Y/Zn比相同) 對通過這種制備方式獲得的Mg-Zn-Zr-Y合金顯微組織、顯微硬度和熱裂傾向的影響。結(jié)果表明:一定Y/Zn比的Mg-Zn-Zr-Y合金通過水冷冷卻可獲得更大的冷卻速度,有利于獲得更大體積分?jǐn)?shù)的I-相(Mg3YZn6)。Y元素的添加使合金的成分過冷度增大,是鑄態(tài)合金顯微組織細(xì)化的主要原因。α-Mg基體中固溶的Zn含量是Mg-Zn-Zr-Y鑄態(tài)合金基體硬度值的主要決定因素,I-相具有遠(yuǎn)高于α-Mg基體的硬度。Y元素引起合金液相線溫度的大幅下降,固相線溫度沒有變化,從而減小了合金凝固區(qū)間,降低了鑄錠的熱裂傾向

    Abstract:

    Mg-Zn-Zr-Y alloys containing quasicrystal phase were prepared by an as-cast method with water-cooling. On this base, the effects of different Zn and Y content (the same Zn/Y ratio) on microstructure and micro-hardness were also discussed. The results show that the increase of cooling rate by water-cooling can increase the volume fraction of quasicrystal phase (I-phase, Mg3YZn6) of Mg-Zn-Zr-Y alloy. The decreasing of grain sizes of the as-cast alloy is due to the increase of constitutional supercooling by Y addition. The solid solubility of Zn in α-Mg matrix mainly affects the hardness of the matrix, and the hardness of I-phase is much higher than that of the matrix. The liquidus temperature decreases substantially while the solid temperature does not change with Y addition, which weakens the hot cracking tendency of the ingot due to the decrease of freezing range.

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呂濱江,彭 建,韓 韡,湯愛濤,潘復(fù)生.水冷對普通鑄造Mg-Zn-Zr-Y鎂合金準(zhǔn)晶相形成的影響及鑄態(tài)組織研究[J].稀有金屬材料與工程,2014,43(7):1643~1648.[Lü Binjiang, Peng Jian, Han Wei, Tang Aitao, Pan Fusheng. Effects of Water-Cooling on Quasicrystal Formation of As-Cast Mg-Zn-Zr-Y Alloys and the Microstructure[J]. Rare Metal Materials and Engineering,2014,43(7):1643~1648.]
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  • 收稿日期:2013-07-18
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  • 在線發(fā)布日期: 2014-12-15
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