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等通道轉(zhuǎn)角擠壓ZK31+4Si鎂合金的顯微組織及高溫蠕變行為
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山西省青年科技研究基金(2008021033)；山西省歸國(guó)留學(xué)基金(2007-25)；山西省大學(xué)生創(chuàng)新創(chuàng)業(yè)專項(xiàng)基金(07010727)


Microstructure and Creep Behavior of ECAPed ZK31+4Si Magnesium Alloy
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    摘要:

    研究ZK31+4Si鎂合金經(jīng)等通道轉(zhuǎn)角擠壓 (ECAP) 后的微觀組織和高溫蠕變行為。結(jié)果表明，ECAP擠壓可顯著細(xì)化原鑄態(tài)組織中粗大的漢字狀Mg2Si相，并使其趨于均勻彌散分布。ECAP擠壓后試樣的抗蠕變性能明顯優(yōu)于鑄態(tài)試樣，在溫度為473 K，應(yīng)力為70 MPa的條件下，8道次擠壓試樣的穩(wěn)態(tài)蠕變速率約為鑄態(tài)試樣的1/15，蠕變壽命提高近8倍。由穩(wěn)態(tài)蠕變速率與應(yīng)力的對(duì)數(shù)曲線關(guān)系求得473 K下4道次擠壓和8道次擠壓試樣的應(yīng)力指數(shù)n均約為4，同時(shí)按位錯(cuò)蠕變機(jī)制，當(dāng)應(yīng)力指數(shù)n=4時(shí)，理論計(jì)算所得穩(wěn)態(tài)蠕變速率與實(shí)驗(yàn)值非常吻合，說(shuō)明在本實(shí)驗(yàn)條件下發(fā)生的是位錯(cuò)蠕變。

    Abstract:

    The microstructures and the creep behavior of ZK31+4Si magnesium alloy processed by Equal channel angular pressing (ECAP) were investigated. The experimental results show that the coarse Chinese script-like Mg2Si precipitates are refined to fine polygonal shape particles and redistributed dispersedly after ECAP. The creep resistance is greatly enhanced after ECAP. The ctable creep rate of the 8-pass ECAPed specimen is nearly 1/15 of that of the as-cast one, and its creep life is increased by about 8 times. The curves of the minimum strain rate versus the stress show that the alloy ECAPed either through 8 passes or through 4 passes exhibit a same stress exponent n?4. Furthermore, the theoretical calculation results according to the dislocation creep model with n=4 are well in agreement with the experimental values, indicating that the creep under the present test condition is controlled by the movement of dislocations.

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周旭陽(yáng),梁 偉,韓富銀,謝國(guó)印.等通道轉(zhuǎn)角擠壓ZK31+4Si鎂合金的顯微組織及高溫蠕變行為[J].稀有金屬材料與工程,2012,41(5):867~871.[Zhou Xuyang, Liang Wei, Han Fuyin, Xie Guoyin. Microstructure and Creep Behavior of ECAPed ZK31+4Si Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(5):867~871.]
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  • 收稿日期:2011-05-12
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