In this study,the hot deformation behavior and microstructural evolution of the GH 4706 alloy under various thermal processing parameters(TPPs)were investigated through hot deformation experiments and electron backsca...In this study,the hot deformation behavior and microstructural evolution of the GH 4706 alloy under various thermal processing parameters(TPPs)were investigated through hot deformation experiments and electron backscatter diffraction(EBSD)microstructural characterization.The findings suggest that increasing hot compression temperature(T)and reducing strain rate(ε)enhance the degree of dynamic recrystallization(DRX),significantly reducing flow stress and weakening texture intensity.Increasing strain(ε)promotes DRX,with the overall texture strength initially increasing before decreasing.During hot compression at 1000−1100℃,discontinuous dynamic recrystallization(DDRX),continuous dynamic recrystallization(CDRX),and twin-induced dynamic recrystallization(TDRX)jointly influence texture development.Among these,DDRX plays a dominant role,with numerous DDRX grains exhibiting dispersed orientations,significantly contributing to texture weakening.The CDRX mechanism induces a limited number of randomly oriented grains within the deformed grains,and its contribution to texture weakening is enhanced with increasingεand decreasing T.The TDRX mechanism generates DRX grains withinΣ3 twin boundaries deviating from their theoretical orientation,and these grains inherit the twin orientation,exerting a limited effect on texture weakening.These findings provide a theoretical foundation for a deeper understanding of DRX behavior and texture evolution in the GH 4706 during hot working.展开更多
采用可逆加成-断裂链转移聚合法(RAFT)制得PNIPAM-macroCTA大分子引发剂(2);2与苯硼酸(PBA)衍生物单体(3)直接共聚合成了含苯硼酸的嵌段共聚物PNIPAM-b-PPBA(4),其结构经1 H NMR和GPC确证。采用1 H NMR和动态光散射(DLS)对4在溶液中的...采用可逆加成-断裂链转移聚合法(RAFT)制得PNIPAM-macroCTA大分子引发剂(2);2与苯硼酸(PBA)衍生物单体(3)直接共聚合成了含苯硼酸的嵌段共聚物PNIPAM-b-PPBA(4),其结构经1 H NMR和GPC确证。采用1 H NMR和动态光散射(DLS)对4在溶液中的自组装行为进行了研究。结果表明:4具有pH和糖双重响应性,可形成以PPBA为核,PNIPAM为壳的胶束。展开更多
基金Project(2022YFB3705103)supported by the National Key R&D Program,China。
文摘In this study,the hot deformation behavior and microstructural evolution of the GH 4706 alloy under various thermal processing parameters(TPPs)were investigated through hot deformation experiments and electron backscatter diffraction(EBSD)microstructural characterization.The findings suggest that increasing hot compression temperature(T)and reducing strain rate(ε)enhance the degree of dynamic recrystallization(DRX),significantly reducing flow stress and weakening texture intensity.Increasing strain(ε)promotes DRX,with the overall texture strength initially increasing before decreasing.During hot compression at 1000−1100℃,discontinuous dynamic recrystallization(DDRX),continuous dynamic recrystallization(CDRX),and twin-induced dynamic recrystallization(TDRX)jointly influence texture development.Among these,DDRX plays a dominant role,with numerous DDRX grains exhibiting dispersed orientations,significantly contributing to texture weakening.The CDRX mechanism induces a limited number of randomly oriented grains within the deformed grains,and its contribution to texture weakening is enhanced with increasingεand decreasing T.The TDRX mechanism generates DRX grains withinΣ3 twin boundaries deviating from their theoretical orientation,and these grains inherit the twin orientation,exerting a limited effect on texture weakening.These findings provide a theoretical foundation for a deeper understanding of DRX behavior and texture evolution in the GH 4706 during hot working.
文摘采用可逆加成-断裂链转移聚合法(RAFT)制得PNIPAM-macroCTA大分子引发剂(2);2与苯硼酸(PBA)衍生物单体(3)直接共聚合成了含苯硼酸的嵌段共聚物PNIPAM-b-PPBA(4),其结构经1 H NMR和GPC确证。采用1 H NMR和动态光散射(DLS)对4在溶液中的自组装行为进行了研究。结果表明:4具有pH和糖双重响应性,可形成以PPBA为核,PNIPAM为壳的胶束。
