文章基于中国知网中2009—2023年间的169篇文献和Web of Science中2016—2023年间的572篇文献,使用Citespace V.5.0.R4软件梳理了国内外零工研究热点。结果表明:一是国内外研究都重点关注共享经济、平台经济、数字平台等新经济模式。二...文章基于中国知网中2009—2023年间的169篇文献和Web of Science中2016—2023年间的572篇文献,使用Citespace V.5.0.R4软件梳理了国内外零工研究热点。结果表明:一是国内外研究都重点关注共享经济、平台经济、数字平台等新经济模式。二是国外比国内研究更关注零工工作者与数字平台工作及其算法的关系。三是自2018年,国内热点逐渐从零工市场与共享经济转向在线平台和法律监管;自2019年,国外热点逐渐聚焦于零工工作者。文后讨论了零工研究的未来方向,以期为推进零工研究提供有益参考。展开更多
The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as w...The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as well as the full-lamellar structure.The low-cost Ti-42.5Al-2Mn-0.4Mo-0.1B-0.1C(at.%)alloy was designed,which undergoes bothβandαsingle-phase region during the solidification.It is found that the full-lamellar structure can be obtained by the solution heat treatment at 1230℃ for 20 min and then aging treatment at 800℃ for 3 h.Interestingly,a new microstructure,namely,the pearlitic-like microstructure(PM)induced by theα_(2)/γ→βo+γcellular reaction was observed when the aging temperature is increased to above 800℃.The volume fraction of the PM is gradually increased from 0%to 25.5%,65%,and 94%according to elevated aging temperature from 800 to 900,1000,and 1050℃,respectively.The mechanism of the reducedα_(2)/γlamellae and PM formation was discussed regarding the heterogeneous distribution ofβstabilizing elements and the interface energy stored inα_(2)/γlamellae.展开更多
文摘文章基于中国知网中2009—2023年间的169篇文献和Web of Science中2016—2023年间的572篇文献,使用Citespace V.5.0.R4软件梳理了国内外零工研究热点。结果表明:一是国内外研究都重点关注共享经济、平台经济、数字平台等新经济模式。二是国外比国内研究更关注零工工作者与数字平台工作及其算法的关系。三是自2018年,国内热点逐渐从零工市场与共享经济转向在线平台和法律监管;自2019年,国外热点逐渐聚焦于零工工作者。文后讨论了零工研究的未来方向,以期为推进零工研究提供有益参考。
基金the Jihua Laboratory Scientific Research Project(No.X210291TL210)the National Natural Science Foundation of China(No.51971215).
文摘The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as well as the full-lamellar structure.The low-cost Ti-42.5Al-2Mn-0.4Mo-0.1B-0.1C(at.%)alloy was designed,which undergoes bothβandαsingle-phase region during the solidification.It is found that the full-lamellar structure can be obtained by the solution heat treatment at 1230℃ for 20 min and then aging treatment at 800℃ for 3 h.Interestingly,a new microstructure,namely,the pearlitic-like microstructure(PM)induced by theα_(2)/γ→βo+γcellular reaction was observed when the aging temperature is increased to above 800℃.The volume fraction of the PM is gradually increased from 0%to 25.5%,65%,and 94%according to elevated aging temperature from 800 to 900,1000,and 1050℃,respectively.The mechanism of the reducedα_(2)/γlamellae and PM formation was discussed regarding the heterogeneous distribution ofβstabilizing elements and the interface energy stored inα_(2)/γlamellae.
