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Ca對(duì)高Zn鎂合金高溫抗蠕變性能的影響
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國家科技支撐計(jì)劃(2006BAE04B07)


Effects of Calcium Addition on High Temperature Creep Resistance of Magnesium Alloys with High Zinc
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    摘要:

    系統(tǒng)研究了微量Ca的加入對(duì)Mg-12Zn-4Al-0.3Mn合金顯微組織和高溫抗蠕度性能的影響。結(jié)果表明，Mg-12Zn-4Al-0.3Mn鑄造鎂合金的顯微組織主要由α-Mg基體和塊狀準(zhǔn)晶晶界相組成，在成分上準(zhǔn)晶相與三元平衡相圖中τ相(Mg32(Al,Zn)49)接近。少量Ca加入母合金后，塊狀準(zhǔn)晶相部分轉(zhuǎn)變?yōu)棣酉嗪蛯悠瑺瞀障?Al2Mg5Zn2)。隨Ca加入量增加，φ相的體積分?jǐn)?shù)增多。Ca的加入顯著提高了合金高溫抗蠕變性能，175 ℃, 70 MPa蠕變條件下，Ca加入量為0.6%時(shí)，合金呈現(xiàn)最好的蠕變抗力，其穩(wěn)態(tài)蠕變速率比母合金下降了近一個(gè)數(shù)量級(jí)

    Abstract:

    The effects of trace Ca addition on microstructure and high-temperature creep resistance of as-cast Mg-12Zn-4Al-0.3Mn alloy were investigated. Results show that the as-cast microstructure of the base alloy consists of α-Mg matrix and block quasicrystalline phase at gain boundaries. The composition of this quasicrystalline phase is closed to that of the equilibrium t phase (Mg32(Al,Zn)49) in the Mg-Zn-Al ternary system. A small amount of Ca addition to the base alloy results in the formation of a lamellar eutectic j (Al2Mg5Zn2) and the transformation of the quasicrystalline phase to the equilibrium t phase in the as-cast microstructure of the alloy. The volume fraction of the j phase increases with the increase of Ca addition. The creep resistance of the alloys is significantly improved by Ca addition. The optimum creep resistance of the alloy is obtained by 0.6% Ca addition under the creep condition of 175 oC, 70 MPa, whose steady state creep rate is approximately one order of magnitude lower than that of its base alloy.

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萬曉峰,孫揚(yáng)善,薛 烽,白 晶,陶衛(wèi)建. Ca對(duì)高Zn鎂合金高溫抗蠕變性能的影響[J].稀有金屬材料與工程,2010,39(12):2112~2116.[Wan Xiaofeng, Sun Yangshan, Xue Feng, Bai Jing, Tao Weijian. Effects of Calcium Addition on High Temperature Creep Resistance of Magnesium Alloys with High Zinc[J]. Rare Metal Materials and Engineering,2010,39(12):2112~2116.]
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  • 收稿日期:2009-12-24
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