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等通道轉(zhuǎn)角擠壓Al-Mg2Si合金的組織與性能研究
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山西省自然科學(xué)基金(2006011051); 山西省歸國(guó)留學(xué)基金(2007-25); 山西省青年科技研究基金(2008021033); 大學(xué)生創(chuàng)新創(chuàng)業(yè)專項(xiàng)基金(08122067)


Microstructure and Properties of Al-Mg2Si Alloys after Equal Channel Angular Pressing
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    摘要:

    研究Al-Mg2Si合金經(jīng)250 ℃等通道轉(zhuǎn)角擠壓后的微觀組織與力學(xué)性能。維氏硬度及拉伸力學(xué)性能測(cè)試結(jié)果表明：經(jīng)4道次ECAP擠壓后，Al-Mg2Si合金的硬度、抗拉強(qiáng)度和延伸率均顯著提高；8道次擠壓后合金的塑性進(jìn)一步提高，但其硬度和抗拉強(qiáng)度卻有所下降。掃描電子顯微鏡和透射電子顯微鏡分析表明：經(jīng)ECAP擠壓后，原漢字狀或骨骼狀Mg2Si相顯著碎化，且擠壓道次越多，Mg2Si相的破碎效果越明顯，合金組織也不斷細(xì)化。對(duì)合金經(jīng)較多道次擠壓后硬度及抗拉強(qiáng)度反而有所下降的原因進(jìn)行了分析

    Abstract:

    The microstructure and mechanical properties of Al-Mg2Si alloys by equal channel angular pressing (ECAP) at 250 oC were studied. Vickers hardness and tensile testing show that the hardness, tensile strength and elongation of the alloys increase after ECAP for 4 passes. However, the hardness and tensile strength decrease after ECAP for 8 passes while the elongation increases further. SEM and TEM observations show that the original skelecton shape or the Chinese-script Mg2Si phase are obviously broken after ECAP. The more the extrusion passes, the more the fragmentated Mg2Si phase, and the more the alloys refining. The mechanism for the decrease in hardness and tensile strength of the specimen after ECAP for 8 passes compared with 4 passes was discussed.

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陳克華,梁 偉,王順旗,薛晉波,王紅霞,邊麗萍.等通道轉(zhuǎn)角擠壓Al-Mg2Si合金的組織與性能研究[J].稀有金屬材料與工程,2010,39(2):352~356.[Chen Kehua, Liang Wei, Wang Shunqi, Xue Jinbo, Wang Hongxia, Bian Liping. Microstructure and Properties of Al-Mg2Si Alloys after Equal Channel Angular Pressing[J]. Rare Metal Materials and Engineering,2010,39(2):352~356.]
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  • 收稿日期:2009-01-12
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