title: Nanoscale precipitates strengthened lanthanum-bearing Mg-3Sn-1Mn alloys through continuous rheo-rolling.
abstract: 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.
authors.affiliation: School of Materials Science and Engineering, Northeastern University, Shenyang 110819, P.R. China.|State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P.R. China.
authors.forename: R G
authors.initials: RG
authors.lastname: Guan
authors.affiliation: School of Materials Science and Engineering, Northeastern University, Shenyang 110819, P.R. China.|State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, P.R. China.
authors.forename: Y F
authors.initials: YF
authors.lastname: Shen
authors.affiliation: School of Materials Science and Engineering, Northeastern University, Shenyang 110819, P.R. China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Zhao
authors.affiliation: Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, TX 79968, USA.
authors.forename: R D K
authors.initials: RD
authors.lastname: Misra