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鑄態(tài)Mg-5Sn-(0~2)Cu合金的顯微組織，力學(xué)性能和蠕變性能
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Microstructure, Mechanical Properties and Compressive Creep Behavior of as-Cast Mg-5Sn-(0~2)Cu Alloys
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    摘要:

    利用XRD，SEM手段研究了鑄態(tài)Mg-5Sn-(0~2.0)Cu合金的顯微結(jié)構(gòu)。結(jié)果表明Mg-5Sn合金由枝晶狀的α-Mg和Mg2Sn相組成，Cu的加入使合金出現(xiàn)Mg2Cu相。隨著Cu含量的增加，晶粒逐漸細(xì)化，Mg2Sn相和Mg2Cu相的量也逐漸增加，但是這兩種相的尺寸亦隨之增加。室溫拉伸結(jié)果表明，Cu質(zhì)量分?jǐn)?shù)在0.5%~1.0%時(shí)對合金起促進(jìn)作用，然而，過多的Cu會弱化合金的拉伸性能。Mg-5Sn-1.0Cu合金具有最優(yōu)的力學(xué)性能，抗拉強(qiáng)度達(dá)到180 MPa，延伸率達(dá)到12%。合金在溫度為175 ℃，載荷為35~75 MPa的壓蠕變性能表明，Cu可以提高M(jìn)g-Sn合金的抗蠕變性能。

    Abstract:

    The microstructures of the as-cast Mg-5Sn alloys with 0.5wt%, 1wt%, and 2wt% Cu addition were characterized by XRD and SEM. The results show that besides α-Mg and Mg2Sn phase, Mg2Cu appears in the Cu containing alloys. The addition of Cu results in obvious grain refinement. With Cu content increasing, the amounts of Mg2Sn and Mg2Cu increase, but the sizes of these two intermetallics coarsen. The tensile test at the ambient temperature shows that when Cu content is in the range of 0.5wt%~1.0wt%, the Cu addition helps to improve the strength of the alloys; however, excessive Cu addition leads to the deterioration of the ultimate strength. The optimum mechanical property is attained at Mg-5Sn-1.0Cu alloy, where the UTS and the elongation reach 180 MPa and 12%, respectively. The behavior of the Mg-Sn-Cu alloy in the compressive creep at 175 °C at applied load of 35~75 MPa was also investigated, which shows that the Cu addition helps to improve the compressive creep resistance of Mg-Sn alloy.

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唐涌清,陳云貴,肖素芬,丁武城,王春明,劉 霞.鑄態(tài)Mg-5Sn-(0~2)Cu合金的顯微組織，力學(xué)性能和蠕變性能[J].稀有金屬材料與工程,2014,43(6):1291~1295.[Tang Yongqing, Chen Yungui, Xiao Sufen, Ding Wucheng, Wang Chunming, Liu Xia. Microstructure, Mechanical Properties and Compressive Creep Behavior of as-Cast Mg-5Sn-(0~2)Cu Alloys[J]. Rare Metal Materials and Engineering,2014,43(6):1291~1295.]
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  • 收稿日期:2014-06-18
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  • 在線發(fā)布日期: 2014-11-13
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