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Sm對AM60合金顯微組織和力學(xué)性能的影響
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國家自然科學(xué)基金 (50571073); 山西省自然科學(xué)基金 (2009011028-3，20051052); 科技部科技人員服務(wù)企業(yè)引動資助項目(2009GJA30022)資助


Effect of Sm on Microstructure and Mechanical Properties of AM60 Magnesium Alloy
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    摘要:

    借助光學(xué)顯微鏡、掃描電鏡、X射線衍射儀和DNS100電子萬能試驗機(jī)研究AM60合金中加入Sm后的顯微組織和力學(xué)性能，并分析Sm對合金顯微組織和力學(xué)性能的影響。結(jié)果表明，添加元素 Sm可以細(xì)化鎂合金的晶粒，改變β相的形態(tài)和大小，從連續(xù)或斷續(xù)網(wǎng)狀、長條狀，變?yōu)槁咽癄罨蝾w粒狀均勻彌散分布在α-Mg基體上，顯著改善合金的顯微組織。Sm的加入可形成穩(wěn)定性較高的顆粒狀A(yù)l2Sm高溫化合物相。隨著 Sm 含量的增加，合金的抗拉伸強(qiáng)度和伸長率呈現(xiàn)先升后降的趨勢，當(dāng) Sm 含量為1.0 %(質(zhì)量分?jǐn)?shù), 下同)時抗拉伸強(qiáng)度和伸長率分別達(dá)到最大值210 MPa和6.9%。室溫下AM60合金的斷口呈解理斷裂，加入Sm 變質(zhì)后其斷口形貌表現(xiàn)為準(zhǔn)解理+局部韌性斷裂特征

    Abstract:

    Microstructures and mechanical properties of AM60 magnesium alloy with Sm addition were investigated through OM, SEM XRD and DNS100 electronic universal testing machines. The results show that the addition of Sm can refine grains, change the morphology and the size of β-Mg17A112 phase from continuous/discontinuous netlike or strip form to cobble or particulate form. The distribution also becomes homogeneous and dispersed, and obviously improves the microstructure. After Sm addition to the alloy, the dispersed, high-melting-point particles (mainly Al2Sm phase) are formed. With increasing of Sm content, the tensile strength and elongation of AM60 magnesium alloy increase first and then decrease. With addition of 1.0wt% Sm, the tensile strength and elongation of the alloy reach the maximum 210 MPa and 6.9%, respectively. The tensile fracture mechanism of AM60 magnesium alloy is changed from cleavage fracture to quasi-cleavage fracture with toughness characteristic.

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張金山,姬國強(qiáng),王 星,張照光,許春香,王紅霞,陶衛(wèi)建,孫 勇. Sm對AM60合金顯微組織和力學(xué)性能的影響[J].稀有金屬材料與工程,2012,41(4):617~622.[Zhang Jinshan, Ji Guoqiang, Wang Xing, Zhang Zhaoguang, Xu Chunxiang, Wang Hongxia, Tao Weijian, Sun Yong. Effect of Sm on Microstructure and Mechanical Properties of AM60 Magnesium Alloy[J]. Rare Metal Materials and Engineering,2012,41(4):617~622.]
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  • 收稿日期:2011-04-10
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