| 1 | Effect of Temperature on Material Transfer Behavior at Different Stages of Friction Stir Welded 7075-T6 Aluminum Alloy显示文摘In this work,the morphologies of weld of 7075-T6 aluminum alloy via friction stir welding(FSW) were analyzed by optical microscopy,the temperature field was attained by numerical simulation,and the effect of temperature on material transfer behavior in the thermal-mechanical affected zone(TMAZ) at different stages was mainly investigated.The FSW process consists of three stages.It is very interesting to find that the maximum transfer displacement of material appears at the final stage of welding process,then at the stable stage and at the initial stage,which results from the difference of peak temperatures at different stages.At any stage,the material in TMAZ near the surface of weld transfers downwards,the material in the middle of weld moves upwards and the material near the bottom of weld hardly moves.In any cross section of weld,the largest transfer displacement of material appears in the middle of weld.The increase of rotational velocity and the decrease of welding speed are both beneficial to the transfer displacement of material in the middle of weld. | S.D.Ji Y.Y.Jin Y.M.Yue S.S.Gao Y.X.Huang L.Wang | 2013 | Journal of Materials Science & Technology2013，29，10： | 6 |
| 2 | A novel friction stir diffusion bonding process using convex-vortex pin tools显示文摘In this work,a novel friction stir diffusion bonding(FSDB)method was proposed to eliminate hook when joining thin sheets.Three tools,with several convex-vortex pins were innovatively designed to improve the diffusion bonding effect of the lap interface.Results showed that sound joints,excellently bonded at the lap interface and without hook,were obtained.The lap interfaces on the joints welded using the T-tool and F-tool almost remained intact,thereby indicating that they were formed by diffusion bonding.The material flow behavior was also simulated by FLUENT software and the results showed that the material flow along thickness was significantly enhanced by increasing the pin number.The joint welded by the T-tool showed shear fracture mode.Sound bonding was formed at the lap interface when using the F-tool and thus the joint showed tensile fracture. | S.D.Ji Q.Wen Z.W.Li | 2020 | Journal of Materials Science & Technology2020，47，13： | 1 |
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