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Sn對ZM61合金組織與性能的影響
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國家“973”重大基礎(chǔ)研究項(xiàng)目(2007CB613700)；國家十二五科技支撐計(jì)劃項(xiàng)目(2011BAE22B03-3)；國家杰出青年科學(xué)基金 (50725413)；科技部國際合作項(xiàng)目(2010DFR50010，2008DFR50040)；重慶市科委項(xiàng)目(2010CSTC-HDLS)；中央高?；究蒲袠I(yè)務(wù)費(fèi)(CDJXS11132228)


Effects of Sn on Microstructure and Mechanical Properties of ZM61 Alloy
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    摘要:

    通過光學(xué)金相(OM)，掃描電鏡(SEM)，X射線衍射(XRD)等分析方法，研究不同Sn含量對Mg-6Zn-1Mn(ZM61)合金顯微組織和力學(xué)性能的影響，并初步探討Sn元素在鎂合金中的存在形式和作用機(jī)理。結(jié)果表明：Sn元素在ZM61合金中主要以Mg2Sn相存在；Sn元素不僅可以改善合金的鑄造性能，所形成彌散的Mg2Sn相顆粒還可以明顯的細(xì)化晶粒改善組織，提高合金的力學(xué)性能，其中經(jīng)440 ℃, 2 h+90 ℃, 24 h+180 ℃, 8 h雙級時(shí)效處理的ZM61-4Sn合金具有最佳的綜合力學(xué)性能，其屈服強(qiáng)度、抗拉強(qiáng)度和延伸率分別為358 MPa、374 MPa和4.6%；Sn的加入不會(huì)改變合金的斷裂機(jī)制，但是粗大的Mg2Sn粒子會(huì)成為裂紋源，從而降低合金的塑性，所以Sn含量不宜過高，不大于4%較為合適

    Abstract:

    The microstructure and mechanical properties of the ZM61 alloy (Mg-6Zn-1Mn) with different Sn content were researched by optical microscope (OM), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and tensile tests. The existence form and acting mechanism of Sn element in ZM61 alloy and the influence of Sn content on microstructure and mechanical properties were investigated. The results show that the addition of Sn can improve the casting fluidity and the formation of the dispersed Mg2Sn particles can refine the MgZn phase to improve the microstructure and the mechanical properties of ZM61 alloy. The ZM61-4Sn alloy with double aging treatment has the best mechanical properties, with tensile strength of 374 MPa, yield strength of 358 MPa and elongation of 4.6%. However the addition of Sn cannot change the fracture behavior of ZM61 alloy while the coarse Mg2Sn phase can become crack source during fracture to decrease the plasticity. Therefore, Sn content should not be too high, no more than 4%.

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張丁非,徐杏杏,齊福剛,朱曾濤. Sn對ZM61合金組織與性能的影響[J].稀有金屬材料與工程,2013,42(5):931~936.[Zhang Dingfei, Xu Xingxing, Qi Fugang, Zhu Zengtao. Effects of Sn on Microstructure and Mechanical Properties of ZM61 Alloy[J]. Rare Metal Materials and Engineering,2013,42(5):931~936.]
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  • 收稿日期:2012-04-16
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