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 syntheses of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials have been reported and these materials have been developed as excellent MRI contrast agents.Due to the close interrelation between their morphology and pro...The syntheses of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials have been reported and these materials have been developed as excellent MRI contrast agents.Due to the close interrelation between their morphology and properties,it has resulted in the development of various particle sizes and shapes of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials.This has led to the extension of the uses of the materials to photocatalysis,drug delivery,and CT image contrast agents.Accordingly,these applications have been compiled and discussed in depth in this review.The potential of these materials in the above applications has started to attract significant attention.Moreover,the compilation of in-vitro toxicity studies from the literature was also discussed to facilitate the biocompatibility of the developed Gd(OH)_(3)nanomaterials.However,despite the rapid progress of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials,there are still knowledge gaps in certain areas.Therefore,this review provides insights into the recent development of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials to aid in accelerating novel developments.展开更多
广东电力行业的碳中和是落实总体碳中和目标的前提和重要途径。基于GD-Enduse模型,以电力系统成本最小化为总目标,刻画了3种广东电力碳中和技术路径并展开定量与定性分析。结果表明:情景CM3为最优碳中和技术路径,其可再生能源装机比例达...广东电力行业的碳中和是落实总体碳中和目标的前提和重要途径。基于GD-Enduse模型,以电力系统成本最小化为总目标,刻画了3种广东电力碳中和技术路径并展开定量与定性分析。结果表明:情景CM3为最优碳中和技术路径,其可再生能源装机比例达到60.2%,发电占比达到51.9%;核电稳步发展,其发电量达到总发电量的25.0%;火电机组持续退役,保留一定装机容量的利用小时数减少,留作灵活调峰电源使用;煤电与气电(carbon capture,utilization and storage,CCUS)技术配比分别下降到24.0%和44.0%,生物质CCUS技术配比持续上升至81.8%。广东电力行业碳中和需要CCUS技术大规模介入与以风电、光伏为首的可再生能源技术迅猛发展双管齐下,以“风、光、核、储”为基础,采用火电为灵活调峰电源的电力结构,各类发电技术与负碳技术灵活调节互补短板,从而实现各类电源的协同发展。展开更多
研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金...研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金的真应力真应变曲线都表现出动态再结晶的一般特征。添加Y后,合金的流变应力增高;在低温高应变速率(350℃,0.002 s^(-1))变形时,合金易出现45°角剪切断裂;在400℃变形时,在动态再结晶的晶界处析出第二相,添加Y后GW124K合金动态析出相的数量明显增多;在500℃变形时,发生完全动态再结晶,GW124K合金的再结晶晶粒尺寸(25μm)明显小于GW120K合金(40μm);GW120K合金的热变形激活能为218.788 k J·mol^(-1),添加Y后合金的热变形激活能增高至243.530 k J·mol^(-1);Mg-12Gd-(4Y)-0.5Zr两种合金的失稳区集中在低温高应变区域,添加Y后,合金的失稳区增大,可加工区域减小。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the FRC grant(UBD/RSCH/1.4/FICBF(b)/2023/059)received from Universiti Brunei Darussalam,Brunei Darussalam。
文摘The syntheses of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials have been reported and these materials have been developed as excellent MRI contrast agents.Due to the close interrelation between their morphology and properties,it has resulted in the development of various particle sizes and shapes of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials.This has led to the extension of the uses of the materials to photocatalysis,drug delivery,and CT image contrast agents.Accordingly,these applications have been compiled and discussed in depth in this review.The potential of these materials in the above applications has started to attract significant attention.Moreover,the compilation of in-vitro toxicity studies from the literature was also discussed to facilitate the biocompatibility of the developed Gd(OH)_(3)nanomaterials.However,despite the rapid progress of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials,there are still knowledge gaps in certain areas.Therefore,this review provides insights into the recent development of Gd(OH)_(3)and Gd(OH)_(3)-based nanomaterials to aid in accelerating novel developments.
文摘广东电力行业的碳中和是落实总体碳中和目标的前提和重要途径。基于GD-Enduse模型,以电力系统成本最小化为总目标,刻画了3种广东电力碳中和技术路径并展开定量与定性分析。结果表明:情景CM3为最优碳中和技术路径,其可再生能源装机比例达到60.2%,发电占比达到51.9%;核电稳步发展,其发电量达到总发电量的25.0%;火电机组持续退役,保留一定装机容量的利用小时数减少,留作灵活调峰电源使用;煤电与气电(carbon capture,utilization and storage,CCUS)技术配比分别下降到24.0%和44.0%,生物质CCUS技术配比持续上升至81.8%。广东电力行业碳中和需要CCUS技术大规模介入与以风电、光伏为首的可再生能源技术迅猛发展双管齐下,以“风、光、核、储”为基础,采用火电为灵活调峰电源的电力结构,各类发电技术与负碳技术灵活调节互补短板,从而实现各类电源的协同发展。
文摘研究了Mg-12Gd-0.5Zr(GW120K)合金和Mg-12Gd-4Y-0.5Zr(GW124K)合金在350~500℃,应变速率为0.002~1 s^(-1)的热压缩行为,对合金的流变应力、显微组织进行分析,计算了合金的热变形激活能,构建并分析了合金的热加工图。结果表明:两种合金的真应力真应变曲线都表现出动态再结晶的一般特征。添加Y后,合金的流变应力增高;在低温高应变速率(350℃,0.002 s^(-1))变形时,合金易出现45°角剪切断裂;在400℃变形时,在动态再结晶的晶界处析出第二相,添加Y后GW124K合金动态析出相的数量明显增多;在500℃变形时,发生完全动态再结晶,GW124K合金的再结晶晶粒尺寸(25μm)明显小于GW120K合金(40μm);GW120K合金的热变形激活能为218.788 k J·mol^(-1),添加Y后合金的热变形激活能增高至243.530 k J·mol^(-1);Mg-12Gd-(4Y)-0.5Zr两种合金的失稳区集中在低温高应变区域,添加Y后,合金的失稳区增大,可加工区域减小。
