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Molecular dynamics simulation of tensile behavior of diffusion bonded Ni/Al nanowires
Zhenjiang Hu,Junjie Zhang,Yong Da Yan,Jiuchun Yan,Tao Sun,김동철,강성원 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
Interfaces play key roles in determining mechanical properties of materials. In current work we perform molecular dynamics simulations of diffusion bonding to evaluate the effect of temperature on the morphology of the Ni/Al interface and the strength of the diffusion bonded Ni/Al nanowires. The centro-symmetry parameter is adopted to identify defect atoms generated. Simulation results show that the thickness of the Ni/Al interface has strong dependence on the temperature of diffusion bonding. Following uniaxial tension tests indicate that the yield strength of Ni/Al nanowires is smaller than both the single crystalline Ni and Al nanowires, because of the Ni/Al interface acting as dislocation source and the mobilization of pre-existing dislocations at high temperature. It is shown that the mechanical properties of diffusion bonded Ni/Al nanowires strongly depend on the temperature.
Baoqun Ning,Yong Nie,Qian Wang,Yu Fu,Yue Li,Jian Han,Yingfeng Shao,Jiuchun Yan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
This paper introduced a method of rapid solid-phase bonding Al block with Ag as the intermediate layer by longitudinalultrasonic vibration under eutectic temperature in the atmospheric environment. This method is suitable for the application ofstructural lightweight design. It was observed that Al and Ag difuse with each other in the weld seam to form an intermetallic compound Ag2Al with close hexagonal structure. The efects of diferent reaction temperatures and ultrasonic vibrationtimes on the microstructure and mechanical properties of intermetallic compound Ag2Al were discussed. The infuence ofthe efect of ultrasonic softening waves on surface oxide flm rupture and element difusion was explored. With the increaseof ultrasonic vibration time, the intermetallic compounds grew along with the interface and the thickness increased. Whenthe welding temperature was 500 °C and the ultrasonic vibration was 20 s, the highest average strength of the welded jointreaches 46.68 MPa.