The microstructural development and its effect on the mechanical properties of Al/Cu laminated composite produced by asymmetrical roll bonding and annealing were studied. The composite characterizations were conducted...The microstructural development and its effect on the mechanical properties of Al/Cu laminated composite produced by asymmetrical roll bonding and annealing were studied. The composite characterizations were conducted by transmission electron microscope（TEM）, scanning electron microscope（SEM）, peeling tests and tensile tests. It is found that the ultra-fine grained laminated composites with tight bonding interface are prepared by the roll bonding technique. The annealing prompts the atomic diffusion in the interface between dissimilar matrixes, and even causes the formation of intermetallic compounds. The interfacial bonding strength increases to the maximum value owing to the interfacial solution strengthening at 300 °C annealing, but sharply decreases by the damage effect of intermetallic compounds at elevated temperatures. The composites obtain high tensile strength due to the Al crystallization grains and Cu twins at 300 °C. At 350 °C annealing, however, the composites get high elongation by the interfacial interlayer with submicron thickness.展开更多
文摘目的比较应用FiltekTMZ350 XT通用纳米树脂、FiltekTMZ350 XT流动树脂、SonicFill超声树脂制作并粘接无托槽隐形矫治器附件的操作时间、附件粘接强度及放置精确性。方法收集2018年3—8月于上海交通大学医学院附属第九人民医院口腔正畸科就诊患者因正畸治疗需拔除的健康下颌前磨牙120颗,随机分为A1、B1、C1、A2、B2、C2组,每组20颗。A1、A2组采用3M Adper Single Bond 2粘接剂和FiltekTMZ350 XT通用纳米树脂,B1、B2组采用3M Adper Single Bond 2粘接剂和FiltekTMZ350 XT流动树脂,C1、C2组采用OptiBond S粘接剂和SonicFill超声树脂。A1、B1、C1组测定制作并粘接附件的操作时间和附件的剪切强度,A2、B2、C2组通过测定三维设计附件与实际粘接附件的体积变化来比较附件放置精确性。结果 B1、C1组附件操作时间分别为(2.60±0.32)min、(2.86±0.35)min,均比A1组[(3.52±0.38)min]短,差异有统计学意义(均P <0.05)。C1组附件剪切强度[(23.49±3.57)MPa]高于A1组[(20.53±2.59)MPa]和B1组[(15.3±2.33)MPa],差异均有统计学意义(均P <0.05);A1组附件剪切强度高于B1组,差异有统计学意义(P <0.05)。A2、B2、C2组实际粘接附件与三维设计附件比较,附件体积增量分别为(3.44±1.12)mm3、(5.19±2.10)mm3、(2.57±0.89)mm3,其中A2、C2组附件体积变化小于B2组,差异有统计学意义(均P <0.05)。结论 SonicFill超声树脂制作并粘接附件的操作时间短,附件粘接强度高、放置精确性好,更适宜临床推广。
基金Projects(50971038,51174058)supported by the National Natural Science Foundation of China
文摘The microstructural development and its effect on the mechanical properties of Al/Cu laminated composite produced by asymmetrical roll bonding and annealing were studied. The composite characterizations were conducted by transmission electron microscope（TEM）, scanning electron microscope（SEM）, peeling tests and tensile tests. It is found that the ultra-fine grained laminated composites with tight bonding interface are prepared by the roll bonding technique. The annealing prompts the atomic diffusion in the interface between dissimilar matrixes, and even causes the formation of intermetallic compounds. The interfacial bonding strength increases to the maximum value owing to the interfacial solution strengthening at 300 °C annealing, but sharply decreases by the damage effect of intermetallic compounds at elevated temperatures. The composites obtain high tensile strength due to the Al crystallization grains and Cu twins at 300 °C. At 350 °C annealing, however, the composites get high elongation by the interfacial interlayer with submicron thickness.
