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等通道轉(zhuǎn)角擠壓對(duì)耐熱鎂合金AZ61-4Si組織及性能的影響
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國(guó)家自然科學(xué)基金（50675148）；山西省青年基金（20031039）；太原市大學(xué)生創(chuàng)新創(chuàng)業(yè)人才項(xiàng)目計(jì)劃（120164022）


Effect of Equal Channel Angular Pressing on Microstructure and Properties of AZ61-4Si Heat-Resistant Magnesium Alloy
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    摘要:

    研究了鎂合金AZ61-4Si等通道轉(zhuǎn)角擠壓前后的微觀組織與力學(xué)性能。結(jié)果表明：經(jīng)4道次擠壓后漢字狀Mg2Si相細(xì)化為細(xì)小顆粒狀，基體α-Mg與離異共晶相β-Mg17Al12也得到細(xì)化；合金的屈服強(qiáng)度提高128%，伸長(zhǎng)率提高340%，抗拉強(qiáng)度提高89%，高溫蠕變斷裂壽命提高8倍，蠕變速率為0.058%/h。與4道次相比，經(jīng)8道次擠壓后微觀組織沒有明顯變化；屈服強(qiáng)度有所提高，抗拉強(qiáng)度和延伸率有所降低，高溫蠕變斷裂壽命有所下降，蠕變速率有所提高。對(duì)等通道轉(zhuǎn)角擠壓改善實(shí)驗(yàn)合金微觀組織及力學(xué)性能機(jī)理進(jìn)行了分析

    Abstract:

    The microstructure and mechanical properties of AZ61-4Si magnesium alloy before and after equal channel angular processing (ECAP) were studied. The results show that Chinese script type Mg2Si phase changes into fine granules after 4-pass ECAP. The matrix α-Mg and divorced eutectic β-Mg17Al12 are also refined. The yield strength, elongation and tensile strength are increased by 128%, 340% and 89%, respectively. The high temperature creep fracture life increases by 8 times and the creep rate is 0.058%/h. Compared with the 4-pass ECAP, the microstructure shows little change after 8-pass ECAP. The yield strength and creep rate of the 8-pass ECAPed alloy are improved while the yield strength, elongation and high temperature creep fracture life are reduced. The modification mechanism for microstructure and mechanical properties of the experimental alloy by ECAP was analyzed

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韓富銀,王 萍,田林海,梁 偉,游家學(xué),鐘茜婷.等通道轉(zhuǎn)角擠壓對(duì)耐熱鎂合金AZ61-4Si組織及性能的影響[J].稀有金屬材料與工程,2013,42(7):1497~1501.[Han Fuyin, Wang Ping, Tian Linhai, Liang Wei, You Jiaxue, Zhong Xiting. Effect of Equal Channel Angular Pressing on Microstructure and Properties of AZ61-4Si Heat-Resistant Magnesium Alloy[J]. Rare Metal Materials and Engineering,2013,42(7):1497~1501.]
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  • 收稿日期:2012-07-21
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