Nanoscale precipitates strengthened lanthanum-bearing Mg-3Sn-1Mn alloys through continuous rheo-rolling.
Nanoscale precipitates strengthened lanthanum-bearing Mg-3Sn-1Mn alloys through continuous rheo-rolling.
复制标题
通过连续流变轧制纳米级沉淀强化含镧 Mg-3Sn-1Mn 合金
DOI：
10.1038/srep23154
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发表时间：
2016-03-18
影响因子：
4.6
通讯作者：
Misra RD
中科院分区：
文献类型：
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作者：
Guan RG;Shen YF;Zhao ZY;Misra RD
研究了La（wt.%）对Mg-3Sn-1 Mn-xLa合金显微组织和力学性能的影响。首次采用连续流变轧制的合金板材。在x = 0.2重量%时，La完全溶解在α-Mg基体中。当La含量增加到0.6重量%时，形成了由La 5Sn 3、Mg 2Sn和Mg 17 La 2相组成的板状三相化合物，其平均长度为380 ± 10 nm，平均宽度为110 ± 5 nm。该化合物对α-Mg晶界和位错具有钉扎作用。随着La含量进一步增加至1.0重量%，板状化合物的长度增加到560 ± 10 nm的平均长度，而宽度减小到90 ± 5 nm。随着La含量从0.2wt. %增加到1.4wt.%，Mg 2Sn的颗粒尺寸从100 nm减小到50 nm。在La含量为1.0重量%时，合金的抗拉强度和延伸率最大，分别比Mg-3Sn-1 Mn（wt.%）提高29%和32%。与Mg-3Sn-1 Mn-0.87Ce（wt.%）合金相比，合金
We elucidate the effect of lanthanum (La) on the microstructure and mechanical properties of Mg-3Sn-1Mn-xLa (wt.%) alloy plates processed through continuous rheo-rolling for the first time. At x = 0.2 wt.%, La dissolved completely in the α-Mg matrix. As the La content was increased to 0.6 wt.%, a new plate-shaped three-phase compound composed of La5Sn3, Mg2Sn and Mg17La2 phases was formed with an average length of 380 ± 10 nm and an average width of 110 ± 5 nm. This compound had a pinning effect on the α-Mg grain boundary and on dislocations. With further increase in La-content to 1.0 wt.%, the length of the plate-shaped compound increased to an average length of 560 ± 10 nm, while the width was reduced to 90 ± 5 nm. The particle size of Mg2Sn decreased from 100 nm to 50 nm with increase in La-content from 0.2 to 1.4 wt.%. At La content of 1.0 wt.%, the tensile strength and elongation of the alloy was maximum, with 29% and 32% increase, respectively, compared to the Mg-3Sn-1Mn (wt.%) alloy, and 37% and 89% increase, in comparison to the Mg-3Sn-1Mn-0.87 Ce (wt.%) alloy.