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AZ91+0~2.0%La鑄造鎂合金的組織和力學(xué)性能
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四川省科技廳重點(diǎn)攻關(guān)項(xiàng)目(04GG1589)）


Microstructures and Mechanical Properties of As-Cast AZ91+0-2.0wt.%La Magnesium Alloys
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    摘要:

    利用SEM和XRD等方法研究不同La添加量的AZ91+xLa（x=0%，0.3%，0.5%，0.7%，1.0%，1.5%，2.0%）（質(zhì)量分?jǐn)?shù)，下同）鎂合金的鑄態(tài)顯微組織和相組成，并測試和分析合金的室溫力學(xué)性能。結(jié)果表明：AZ91合金中加入0.3%~2.0%的La后，合金的晶界和枝晶界析出Al11La3化合物，其形態(tài)隨La含量的增加從針狀向片狀過渡，同時β-Mg17Al12相的體積分?jǐn)?shù)及尺寸隨La加入量的增加而減小。此外，La的加入可明顯細(xì)化AZ91合金的顯微組織，其最佳加入量為1.0%~1.5%。稀土La的加入可以明顯改善AZ91合金的力學(xué)性能，其原因與稀土細(xì)化組織、改變β-Mg17Al12相的體積分?jǐn)?shù)及尺寸、彌散強(qiáng)化等有關(guān)。在本試驗(yàn)研究的合金中，AZ91+1.5%La合金力學(xué)性能最好，其鑄態(tài)合金的抗拉強(qiáng)度和斷裂延伸率分別達(dá)到226 MPa和7.5%。

    Abstract:

    The microstructures and phase composition of as-cast AZ91+xLa alloys (x=0%, 0.3%, 0.5%, 0.7%, 1.0%, 1.5% and 2.0%, mass fraction) were investigated by SEM and XRD, and their mechanical properties were tested at room temperature. When 0.3%-2.0% La was added into the AZ91 alloys, Al11La3 phase was precipitated along the grain boundaries and interdendritic boundaries, and its morphology changed from acicular to flake gradually as the La content was increased. Meanwhile the size and volume fraction of β-Mg17Al12 phase was decreased. Moreover, the grain sizes of α-Mg were greatly reduced with La addition, and the best refinement is obtained in alloys containing 1.0%-1.5% La. Mechanical properties of AZ91 magnesium alloy can be improved significantly by addition of La, which results from the fine-grain strengthening of La, the optimization of the morphology and amount of β-Mg17Al12 phase and dispersion strengthening etc. Among all the investigated alloys, the AZ91+1.5%La alloy exhibits the optimum mechanical properties, i.e. the ultimate tensile strength is 226 MPa and the elongation 7.5% at room temperature.

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趙源華,陳云貴,唐永柏,肖素芬,魏尚海,章曉萍,王 卿,涂銘旌. AZ91+0~2.0%La鑄造鎂合金的組織和力學(xué)性能[J].稀有金屬材料與工程,2010,39(5):843~847.[Zhao Yuanhua, Chen Yungui, Tang Yongbai, Xiao Sufen, Wei Shanghai, Zhang Xiaoping, Wang Qing, Tu Mingjing. Microstructures and Mechanical Properties of As-Cast AZ91+0-2.0wt.%La Magnesium Alloys[J]. Rare Metal Materials and Engineering,2010,39(5):843~847.]
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  • 收稿日期:2009-05-20
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