The synergistic effect of low Gd+Mn additions on the evolution of microstructure and mechanical properties of Mg−xGd−0.8Mn alloy was investigated.Gd addition shows a strong grain refinement effect on the extruded Mg−x...The synergistic effect of low Gd+Mn additions on the evolution of microstructure and mechanical properties of Mg−xGd−0.8Mn alloy was investigated.Gd addition shows a strong grain refinement effect on the extruded Mg−xGd−0.8Mn alloy,and leads to a continuous decrease in the area fraction of basal texture grains and the corresponding maximum density of texture components.However,the maximum density of the basal texture components grows abruptly as Gd content increases to 6 wt.%.When the Gd content is below 6 wt.%,the asymmetry of the tensile and compressive yield of the alloy is negatively correlated to the Gd content due to grain refinement and texture weakening effects.Besides,the contribution of grain refinement to higher alloy yield strength is more significant than that of grain orientation.Compared with the extruded Mg−xGd alloy,the extruded Mg−xGd−0.8Mn alloy shows a lower limit composition point that corresponds to solid solution strengthening and plasticizing effect(2 wt.%and 4 wt.%).Finally,the trend of basal slip and prismatic slip resistance variations of the extruded Mg−xGd−0.8Mn alloys was predicted.展开更多
The influence of Mn content on the microstructure,tensile properties and strain-hardening behaviors of extruded Mg−1Gd−0.5Zn−xMn(x=0,0.3 and 1,wt.%)alloy sheets was investigated by X-ray diffraction(XRD),scanning elec...The influence of Mn content on the microstructure,tensile properties and strain-hardening behaviors of extruded Mg−1Gd−0.5Zn−xMn(x=0,0.3 and 1,wt.%)alloy sheets was investigated by X-ray diffraction(XRD),scanning electron microscope(SEM),and electron backscatter diffraction(EBSD).The results show that the completely recrystallized grain structure and the extrusion direction(ED)-titling texture are observed in all the extruded sheets.The mean grain size and weakened ED-titling texture of the extruded sheets are gradually reduced with increasing Mn content.This is primarily associated with the formation of new fineα-Mn particles by Mn addition.Tensile properties show that the addition of Mn also leads to the improvement of yield strengths,ultimate tensile strengths and elongations of the extruded Mg−1Gd−0.5Zn−xMn sheets,which is mainly due to the fine grains andα-Mn particles.In addition,the Mg−1Gd−0.5Zn−1Mn sheet has the lowest strain-hardening exponent and the best hardening capacity among all prepared Mg−1Gd−0.5Zn−xMn sheets.展开更多
Two alloys of Mg-12.4Gd and Mg-12.5Gd-0.8Sc-1.4Mn were prepared. Hot extrusion and T5 heat treatment were conducted,and then the mechanical properties of the two alloys were tested at room and high temperatures. The e...Two alloys of Mg-12.4Gd and Mg-12.5Gd-0.8Sc-1.4Mn were prepared. Hot extrusion and T5 heat treatment were conducted,and then the mechanical properties of the two alloys were tested at room and high temperatures. The effects of Sc,Mn on the microstructures of Mg-12.4Gd were investigated by optical microscopy,scanning electron microscopy and transmission electron microscopy. The results demonstrate that after hot-extrusion the alloying with Sc,Mn can efficaciously refine the grains of Mg-12.4Gd alloy;and increase the elongation at room and high temperatures after T5 heat treatment. But the strength at high temperature is not obviously improved.展开更多
The effects of Ce, Y and Gd additions on the as-cast microstructure and mechanical properties of Mg-3Sn-1Mn alloy were investigated and compared by using optical and electron microscopies, X-ray diffraction analysis, ...The effects of Ce, Y and Gd additions on the as-cast microstructure and mechanical properties of Mg-3Sn-1Mn alloy were investigated and compared by using optical and electron microscopies, X-ray diffraction analysis, and tensile and creep tests. The results indicated that the microstructure of the Mg-3Sn-1Mn alloy with the addition of 0.87 wt.%Ce was refined while the microstructures of the alloys with the additions of 0.79 wt.%Y or 0.84 wt.%Gd were coarsened. Furthermore, adding 0.87 wt.%Ce to the Mg-3Sn-1Mn alloy could improve the tensile properties while adding 0.79 wt.%Y or 0.84 wt.%Gd gave a detrimental effects on the tensile properties. In addition, adding 0.87 wt.%Ce, 0.79 wt.%Y and 0.84 wt.%Gd to the Mg-3Sn-1Mn alloy could improve the creep properties. Among the three additions, the addition of 0.87 wt.%Ce was more suitable to further improve the strength and creep performance of the Mg-3Sn-1Mn alloy.展开更多
基金National Natural Science Foundation of China(No.U2241231)National Key Research and Development Program of China(No.2021YFB3701100)+1 种基金Scientific Research Project of Jiangxi Provincial Department of Education,China(No.GJJ211038)Doctoral Research Project of Jinggangshan University,China(No.JZB2110)。
文摘The synergistic effect of low Gd+Mn additions on the evolution of microstructure and mechanical properties of Mg−xGd−0.8Mn alloy was investigated.Gd addition shows a strong grain refinement effect on the extruded Mg−xGd−0.8Mn alloy,and leads to a continuous decrease in the area fraction of basal texture grains and the corresponding maximum density of texture components.However,the maximum density of the basal texture components grows abruptly as Gd content increases to 6 wt.%.When the Gd content is below 6 wt.%,the asymmetry of the tensile and compressive yield of the alloy is negatively correlated to the Gd content due to grain refinement and texture weakening effects.Besides,the contribution of grain refinement to higher alloy yield strength is more significant than that of grain orientation.Compared with the extruded Mg−xGd alloy,the extruded Mg−xGd−0.8Mn alloy shows a lower limit composition point that corresponds to solid solution strengthening and plasticizing effect(2 wt.%and 4 wt.%).Finally,the trend of basal slip and prismatic slip resistance variations of the extruded Mg−xGd−0.8Mn alloys was predicted.
基金National Natural Science Foundation of China(51571044)National Key Research and Development Program of China(2016YFB0301102)Chongqing Foundation and Advanced Research Project(cstc2015jcyjBX0081)
基金National Great Engineering Research Project of China(2016YFB0301101)Chongqing Technology Innovation and Application Development Special Project(cstc2019jscx-mbdxX0033)。
基金the National Natural Science Foundation of China(Nos.U1764253,U2037601,52001037 and 51971044)the National Defense Basic Scientific Research Program of China+1 种基金the Chongqing Science and Technology Commission,China(No.cstc2017zdcyzdzx X0006)the Qinghai Science and Technology Program,China(No.2018-GX-A1)。
文摘The influence of Mn content on the microstructure,tensile properties and strain-hardening behaviors of extruded Mg−1Gd−0.5Zn−xMn(x=0,0.3 and 1,wt.%)alloy sheets was investigated by X-ray diffraction(XRD),scanning electron microscope(SEM),and electron backscatter diffraction(EBSD).The results show that the completely recrystallized grain structure and the extrusion direction(ED)-titling texture are observed in all the extruded sheets.The mean grain size and weakened ED-titling texture of the extruded sheets are gradually reduced with increasing Mn content.This is primarily associated with the formation of new fineα-Mn particles by Mn addition.Tensile properties show that the addition of Mn also leads to the improvement of yield strengths,ultimate tensile strengths and elongations of the extruded Mg−1Gd−0.5Zn−xMn sheets,which is mainly due to the fine grains andα-Mn particles.In addition,the Mg−1Gd−0.5Zn−1Mn sheet has the lowest strain-hardening exponent and the best hardening capacity among all prepared Mg−1Gd−0.5Zn−xMn sheets.
基金Project (04GK1008-2) supported by the Technology Research Project of Hunan Province, China
文摘Two alloys of Mg-12.4Gd and Mg-12.5Gd-0.8Sc-1.4Mn were prepared. Hot extrusion and T5 heat treatment were conducted,and then the mechanical properties of the two alloys were tested at room and high temperatures. The effects of Sc,Mn on the microstructures of Mg-12.4Gd were investigated by optical microscopy,scanning electron microscopy and transmission electron microscopy. The results demonstrate that after hot-extrusion the alloying with Sc,Mn can efficaciously refine the grains of Mg-12.4Gd alloy;and increase the elongation at room and high temperatures after T5 heat treatment. But the strength at high temperature is not obviously improved.
基金Project supported by the National Natural Science Foundation of China (50725413), the National Basic Research Program of China (973) (2007CB613704)the Chongqing Science and Technology Program of China (2010AC4085, 2009AB4134 and 2006AA4012-9-6)the Pro-gram for Hundreds of Distinguished Leading Scientists of CQ CSTC (2010CSTC-HDLS)
文摘The effects of Ce, Y and Gd additions on the as-cast microstructure and mechanical properties of Mg-3Sn-1Mn alloy were investigated and compared by using optical and electron microscopies, X-ray diffraction analysis, and tensile and creep tests. The results indicated that the microstructure of the Mg-3Sn-1Mn alloy with the addition of 0.87 wt.%Ce was refined while the microstructures of the alloys with the additions of 0.79 wt.%Y or 0.84 wt.%Gd were coarsened. Furthermore, adding 0.87 wt.%Ce to the Mg-3Sn-1Mn alloy could improve the tensile properties while adding 0.79 wt.%Y or 0.84 wt.%Gd gave a detrimental effects on the tensile properties. In addition, adding 0.87 wt.%Ce, 0.79 wt.%Y and 0.84 wt.%Gd to the Mg-3Sn-1Mn alloy could improve the creep properties. Among the three additions, the addition of 0.87 wt.%Ce was more suitable to further improve the strength and creep performance of the Mg-3Sn-1Mn alloy.
