The recently established theory has built clear connections between hardness and toughness and electron structure involving both valence electron concentration(VEC)and core electron count(CEC)in transition metal nitri...The recently established theory has built clear connections between hardness and toughness and electron structure involving both valence electron concentration(VEC)and core electron count(CEC)in transition metal nitride(TMN)ceramics.However,the underlying deformation mechanisms remain unclear.Herein,we conduct in-depth analysis on microstructure evolution during deformation of the high VEC-CEC solution TiMoN coatings having desired combination of high hardness and toughness.The effects of solid solution,preferred orientation linked with symbiotic compressive stress,grain size and dislocations are systematically discussed.We discover that numerous dislocations have been implanted into the nanocrystals of the TiMoN coating during the high-ionization arc deposition.Using two-beam bright-field imaging,we count the dislocation density and confirm occurrence of dislocation multiplication to form effective plastic deformation,which contributes to significant strain hardening,comparable to solid solution hardening,fine-grain hardening and compressive stress hardening.The improved dislocation activities also play a crucial role in enhancing the toughness by providing extra energy dissipation paths.This work gains new insights into the origins of mechanical properties of ceramic coatings and possibility to tune them via defects.展开更多
So far, relatively few scholars have shown special interests in Timon of Athens and those who have, were, more often than not, concerned with textual problems. Wilson Knight, in his essay about the play, offers a prai...So far, relatively few scholars have shown special interests in Timon of Athens and those who have, were, more often than not, concerned with textual problems. Wilson Knight, in his essay about the play, offers a praising tone that Timon of Athens possesses "the nature of a tragic movement more precipitous and unimpeded than any other in Shakespeare; one which is conceived on a scale even more tremendous than that of Macbeth and King Lear; and one whose universal tragic significance is of all most clearly apparent." Aside from this point of view, most critics seem to look at the play as展开更多
基金supported by the Distinguished Young Scholars of China(No.52025014)Natural Science Foundation of Zhejiang Province(No.LQ23E010002)Innovation 2025 Major Project of Ningbo(Nos.2022Z011 and 2023Z022).
文摘The recently established theory has built clear connections between hardness and toughness and electron structure involving both valence electron concentration(VEC)and core electron count(CEC)in transition metal nitride(TMN)ceramics.However,the underlying deformation mechanisms remain unclear.Herein,we conduct in-depth analysis on microstructure evolution during deformation of the high VEC-CEC solution TiMoN coatings having desired combination of high hardness and toughness.The effects of solid solution,preferred orientation linked with symbiotic compressive stress,grain size and dislocations are systematically discussed.We discover that numerous dislocations have been implanted into the nanocrystals of the TiMoN coating during the high-ionization arc deposition.Using two-beam bright-field imaging,we count the dislocation density and confirm occurrence of dislocation multiplication to form effective plastic deformation,which contributes to significant strain hardening,comparable to solid solution hardening,fine-grain hardening and compressive stress hardening.The improved dislocation activities also play a crucial role in enhancing the toughness by providing extra energy dissipation paths.This work gains new insights into the origins of mechanical properties of ceramic coatings and possibility to tune them via defects.
文摘So far, relatively few scholars have shown special interests in Timon of Athens and those who have, were, more often than not, concerned with textual problems. Wilson Knight, in his essay about the play, offers a praising tone that Timon of Athens possesses "the nature of a tragic movement more precipitous and unimpeded than any other in Shakespeare; one which is conceived on a scale even more tremendous than that of Macbeth and King Lear; and one whose universal tragic significance is of all most clearly apparent." Aside from this point of view, most critics seem to look at the play as
