Effect of Sm addition on the microstructure and mechanical properties of Mg-xSm-0.4Zr alloys
Effect of Sm addition on the microstructure and mechanical properties of Mg-xSm-0.4Zr alloys
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DOI：
10.1016/j.jmrt.2023.02.114
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
M. Yuan;Chao He;Z. Dong;B. Jiang;Bo Song;N. Guo;Tingting Liu;Shengfeng Guo;F. Pan
中科院分区：
文献类型：
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作者：
M. Yuan;Chao He;Z. Dong;B. Jiang;Bo Song;N. Guo;Tingting Liu;Shengfeng Guo;F. Pan
用光学显微镜、扫描电子显微镜、X射线衍射仪、背散射电子显微镜和透射电子显微镜研究了Sm对挤压态Mg-xSm-0.4Zr(x1，2，3，4wt%)合金显微组织和拉伸性能的影响。结果表明，所有挤压合金都具有完全动态再结晶(DRXed)组织。当Sm含量超过3wt.%时，挤压板材在热挤压过程中动态析出Mg41Sm5粒子。Sm的加入细化了合金的晶粒度，弱化了合金的织构，显著提高了合金的强度和塑性。当Sm含量为3wt.%时，合金板材表现出良好的强塑性平衡。Mg-3Sm-0.4Zr板材沿ED方向的YS和UTS分别为144.5和280.7，45°的YS和UTS分别为163.8和280.7，TD的YS和UTS分别为163.8和283.9。沿ED、45°和TD方向的ε分别为22.3%、21.6%和19.8%。强化机制主要有晶界强化、固溶强化和析出强化。
Effect of Sm addition on the microstructure and tensile properties of as-extruded Mg–xSm–0.4Zr (x = 1, 2, 3, 4 wt.%) alloys have been investigated by optical microscopy, scanning electron microscopy, X-ray diffraction, electron backscatter diffraction and transmission electron microscope. The results indicat that all the extruded alloys exhibit a fully dynamically recrystallized (DRXed) microstructure. When the Sm content exceeds 3 wt.%, the as extruded sheet dynamic precipitate the Mg41Sm5particles during hot extrusion. Sm addition could refine the grain size and weaken the texture of the as-extruded alloy, significantly enhance the strength and ductility of the as-extruded alloy. When the Sm content is 3 wt.%, the alloy sheet displays a good balance of strength and ductility. The Mg–3Sm–0.4Zr sheet shows YS and UTS of 144.5 MPa and 280.7 MPa along ED, the YS and UTS are 163.8 MPa and 280.7 MPa for 45°and 192 MPa and 283.9 MPa for TD. The ε along the ED, 45°and TD are 22.3%, 21.6% and 19.8%, respectively. The dominant strengthening mechanisms include grain boundary strengthening, solid solution strengthening and precipitation strengthening.