Precipitation-hardenable Mg–2.4Zn–0.1Ag–0.1Ca–0.16Zr (at.%) wrought magnesium alloy
Precipitation-hardenable Mg–2.4Zn–0.1Ag–0.1Ca–0.16Zr (at.%) wrought magnesium alloy
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DOI：
10.1016/j.actamat.2008.10.033
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发表时间：
2009-02
期刊：
影响因子：
9.4
通讯作者：
C. Mendis;K. Oh-ishi;Y. Kawamura;T. Honma;S. Kamado;K. Hono
中科院分区：
文献类型：
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作者：
C. Mendis;K. Oh-ishi;Y. Kawamura;T. Honma;S. Kamado;K. Hono
研制了一种新型Mg-Zn系沉淀硬化变形镁合金，该合金具有高的拉伸屈服强度、良好的塑性和低的拉压各向异性。Mg-2.4Zn-0.1Ag-0.1Ca（-0.16Zr）（at.%）合金显示出显着更高的时效硬化响应相比，二元Mg-2.4Zn合金，由于增加的数量密度和细化的棒状MgZn 2沉淀物。Mg-2.4Zn-0.1Ag-0.1Ca合金中添加Zr导致晶粒尺寸的显著细化。Mg-2.4Zn-0.1Ag-0.1Ca-0.16Zr合金在挤压态和160°C等温时效后均观察到高数量密度的析出物。挤压态和时效态合金的拉伸屈服强度分别为289和325 MPa，伸长率分别为17%和14%。这些合金显示出相对低的压缩和拉伸各向异性。这些独特的机械性能的起源进行了讨论的基础上详细的微观结构调查。
A new precipitation-hardenable wrought magnesium alloy based on the Mg–Zn system with an excellent combination of high tensile yield strength, good ductility and low tensile-compression anisotropy has been developed. The Mg–2.4Zn–0.1Ag–0.1Ca(–0.16Zr) (at.%) alloys show significantly higher age-hardening responses compared to that of the binary Mg–2.4Zn alloy due to the increased number density and refinement of rod-like MgZn2precipitates. The addition of Zr to the Mg–2.4Zn–0.1Ag–0.1Ca alloy resulted in a significant refinement of the grain size. A high number density of precipitates was observed in the Mg–2.4Zn–0.1Ag–0.1Ca–0.16Zr alloy in both the as-extruded condition and following isothermal ageing at 160°C. The tensile yield strength of the as-extruded and aged alloys was 289 and 325MPa, with an elongation of 17% and 14%, respectively. These alloys show relatively low compression and tensile anisotropy. The origins of these unique mechanical properties are discussed based on the detailed microstructural investigation.