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擠壓態(tài)Mg-Sm-Ca合金的顯微組織和力學(xué)性能
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太原科技大學(xué),太原科技大學(xué),太原科技大學(xué),太原科技大學(xué)

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中圖分類號:

TG146.2

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太原科技大學(xué)博士科研啟動項(xiàng)目（20122011）


Microstructure and mechanical properties of extruded Mg-Sm-Ca alloys
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Taiyuan University of Science and Technology,Taiyuan University of Science and Technology,Taiyuan University of Science and Technology,Taiyuan University of Science and Technology

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    摘要:

    研究了擠壓Mg-4.0Sm-xCa (x=0.5, 1.0 and 1.5 wt%)合金經(jīng)過200 oC等溫時效處理后的顯微組織、時效硬化行為和力學(xué)性能。結(jié)果表明，隨著Ca的添加，在鎂基體中形成針/棒狀的Mg2Ca相、塊狀和顆粒狀含Ca元素的Mg41Sm5相，合金的晶粒被細(xì)化、拉伸力學(xué)性能得到顯著提高。在 T5（峰值時效）態(tài)下，Mg-4.0Sm-1.0Ca合金具有最細(xì)的晶粒尺寸，其大小約為 5.1 μm。隨著Ca含量的增加，針/棒狀的Mg2Ca相逐漸增多,當(dāng)Ca含量達(dá)到1.5 wt%時，晶界處含Ca的塊狀Mg41Sm5相的量明顯減少。在峰值時效態(tài)下，Mg-4.0Sm-1.0Ca合金具有最大的硬度值（82 HV）以及最佳的力學(xué)性能，其抗拉強(qiáng)度、屈服強(qiáng)度和延伸率分別達(dá)到了267 MPa, 189 MPa 和 24%。合金力學(xué)性能的提高主要?dú)w因于晶粒細(xì)化、固溶強(qiáng)化以及Mg2Ca相和Mg41Sm5相的析出強(qiáng)化。

    Abstract:

    Microstructure, age hardening response and mechanical properties of Mg-4.0Sm-xCa (x=0.5, 1.0 and 1.5 wt%) alloys during extrusion and subsequent isothermal aging at 200 oC were investigated. The results indicate that with the addition of Ca, the bulk and particle-like Mg41Sm5 phases containing Ca and the needle/rod-like Mg2Ca phases form in the Mg matrix, grains of the alloy are refined and tensile mechanical properties are improved remarkably. In T5 (peak-aging) condition, the Mg-4.0Sm-1.0Ca alloy shows the smallest grain size of 5.1 μm. The amount of Mg2Ca phase increases gradually, but that of the bulk Ca-containing Mg41Sm5 phase in alloy with 1.5 wt% Ca significantly decrease, which mainly distribute at the grain boundaries. The peak-aged Mg-4.0Sm -1.0Ca alloy exhibits the highest peak hardness (82 HV) and the optimal ultimate tensile strength, yield tensile strength and elongation of 267 MPa, 189 MPa and 24%, respectively. The improved mechanical properties of the alloy are attributed to grain refinement, solution strengthening and precipitation strengthening of Mg2Ca phase and Mg41Sm5 phase.

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柴躍生,高志剛,蔡康樂,房大慶.擠壓態(tài)Mg-Sm-Ca合金的顯微組織和力學(xué)性能[J].稀有金屬材料與工程,2016,45(2):287~291.[chaiyuesheng, gao zhi gang, cai kang le, fang da qing. Microstructure and mechanical properties of extruded Mg-Sm-Ca alloys[J]. Rare Metal Materials and Engineering,2016,45(2):287~291.]
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  • 收稿日期:2014-01-22
  • 最后修改日期:2014-07-13
  • 錄用日期:2014-08-12
  • 在線發(fā)布日期: 2016-07-15
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