In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy ...In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy alloys,TWIP steels and stainless steels.However,the common practice of describing interstitial strengthening in f.c.c.alloys using models that are used to explain substitutional strengthening appears to be neither appropriate nor accurate.Here we suggest,based on the literature,that the yield strength increase due to interstitials in f.c.c.alloys is more appropriately described by a linear dependence on the concentration:due to a paucity of experimental studies,the dependence of the yield strength and WHR on misfit parameters is currently unclear.Thus,the source of the strengthening remains unclear.A feature that has been observed in several f.c.c.alloys is that interstitial additions lead to a change from wavy to planar slip although the origin of this change,which may be related to changes in stacking fault energy as well as other factors,remains unclear.The paper concludes by outlining areas of future research,including the need to develop a new model for interstitial strengthening in f.c.c.alloys.展开更多
Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G ...Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G will be Noetherian is given, which generalizes the results of LG. connel.展开更多
Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability...Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability zoning indicators of M.officinalis and S.glabra in Xinfeng County were constructed by relevant statistical methods,and the climate suitability zoning indicators were divided into four grades:most suitable,suitable,sub-suitable and unsuitable.According to the results of expert scores,the relevant growth impact factors were assigned weight values.Based on geographic information system(GIS),the climate suitability zoning of M.officinalis and S.glabra planting in Xinfeng County was carried out.The results show that most areas of Xinfeng County were suitable for planting M.officinalis and S.glabra.Among them,the most suitable planting areas of M.officinalis were mainly distributed in most of Huilong Town,from Jiangnan Community of Fengcheng Street to Yuntianhai area of Meikeng Town,Matouwantian Village and areas to the south,and areas to the south of Zhutong Village,Fengcheng Street.The most suitable areas for S.glabra planting were mainly distributed in Puchang Village of Huilong Town,the northeast of Huangzhai Town,the south of Fengcheng Street,and the central-southern part of Matou Town.The zoning results provide a scientific basis for the rational layout of M.officinalis and S.glabra planting in Xinfeng County.展开更多
基金supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,under Award#DE-SC0018962.
文摘In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy alloys,TWIP steels and stainless steels.However,the common practice of describing interstitial strengthening in f.c.c.alloys using models that are used to explain substitutional strengthening appears to be neither appropriate nor accurate.Here we suggest,based on the literature,that the yield strength increase due to interstitials in f.c.c.alloys is more appropriately described by a linear dependence on the concentration:due to a paucity of experimental studies,the dependence of the yield strength and WHR on misfit parameters is currently unclear.Thus,the source of the strengthening remains unclear.A feature that has been observed in several f.c.c.alloys is that interstitial additions lead to a change from wavy to planar slip although the origin of this change,which may be related to changes in stacking fault energy as well as other factors,remains unclear.The paper concludes by outlining areas of future research,including the need to develop a new model for interstitial strengthening in f.c.c.alloys.
基金Supported by the NSF of Educational Department of Henan Province(20025100003)
文摘Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G will be Noetherian is given, which generalizes the results of LG. connel.
文摘Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability zoning indicators of M.officinalis and S.glabra in Xinfeng County were constructed by relevant statistical methods,and the climate suitability zoning indicators were divided into four grades:most suitable,suitable,sub-suitable and unsuitable.According to the results of expert scores,the relevant growth impact factors were assigned weight values.Based on geographic information system(GIS),the climate suitability zoning of M.officinalis and S.glabra planting in Xinfeng County was carried out.The results show that most areas of Xinfeng County were suitable for planting M.officinalis and S.glabra.Among them,the most suitable planting areas of M.officinalis were mainly distributed in most of Huilong Town,from Jiangnan Community of Fengcheng Street to Yuntianhai area of Meikeng Town,Matouwantian Village and areas to the south,and areas to the south of Zhutong Village,Fengcheng Street.The most suitable areas for S.glabra planting were mainly distributed in Puchang Village of Huilong Town,the northeast of Huangzhai Town,the south of Fengcheng Street,and the central-southern part of Matou Town.The zoning results provide a scientific basis for the rational layout of M.officinalis and S.glabra planting in Xinfeng County.
