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Effect of Y on Microstructure and Mechanical Properties as well as Corrosion Resistance of Mg-9Li-3Al Alloy
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Effect of Y on Microstructure and Mechanical Properties as well as Corrosion Resistance of Mg-9Li-3Al Alloy
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National Basic Research Program of China (2007CB613702); International Scientific and Technological Cooperation Projects (2010DFR50010)

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    摘要:

    采用光學(xué)顯微鏡、SEM掃描電鏡、XRD以及力學(xué)性能和電化學(xué)測(cè)試等手段，研究了不同Y含量對(duì)Mg-9Li-3Al合金組織、力學(xué)性能和腐蝕性能的影響。結(jié)果表明：隨著Y的添加，α相的形貌逐漸發(fā)生變化，其體積分?jǐn)?shù)也逐漸減少，并形成新的Al2Y相，Al2Y主要分布在β相和α相內(nèi)部。當(dāng)Y的添加量為1.6%(質(zhì)量分?jǐn)?shù))時(shí)，材料的抗拉強(qiáng)度達(dá)到最大190.2 MPa；當(dāng)Y含量為2.0%時(shí)，材料的最大延伸率為19.3%。在Y含量低于1.2%時(shí)，材料的抗腐蝕性能隨Y含量的增加而減小，超過(guò)1.2%后，隨著Y含量的增加而增加。

    Abstract:

    The influence of Y on the microstructure, the mechanical property and the corrosion resistance of Mg-9Li-3Al alloy was investigated by optical microscopy, scanning electronic microscopy (SEM), X-ray diffraction (XRD), mechanical properties testing and electrochemical measurement. The results show that the addition of Y can change the microstructure form of the α phase and reduce its volume fraction. Meanwhile, the binary Al2Y phase is mainly distributed inside the β phase and the α phase is formed. The addition of Y can effectively improve the ultimate tensile strength (UTS) and the elongation (EL) of the alloy. Upon 1.6 wt% Y addition, the UTS of the alloy is up to 190 MPa; the maximal EL reaches 19.3% when the content of Y is 2wt%. The corrosion resistances of the alloy are found to decrease upon Y content less than 1.2wt% and then increase upon Y content from 1.2wt% to 2.0wt%.

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彭曉東,李俊辰,李文娟,楊 艷,魏群義. Effect of Y on Microstructure and Mechanical Properties as well as Corrosion Resistance of Mg-9Li-3Al Alloy[J].稀有金屬材料與工程,2013,42(10):1993~1998.[Peng Xiaodong, Li Junchen, Li Wenjuan, Yang Yan, Wei Qunyi. Effect of Y on Microstructure and Mechanical Properties as well as Corrosion Resistance of Mg-9Li-3Al Alloy[J]. Rare Metal Materials and Engineering,2013,42(10):1993~1998.]
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  • 收稿日期:2012-09-30
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