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| 1 | Improving friction stir weldability of Al/Mg alloys via ultrasonically diminishing pin adhesion显示文摘Formation of intermetallic compounds(IMCs) during friction stir welding(FSW) of aluminum/magnesium(Al/Mg) alloys easily results in the pin adhesion and then deteriorates joint formation. The severe pin adhesion transformed the tapered-and-screwed pin into a tapered pin at a low welding speed of 30 mm/min. The pin adhesion problem was solved with the help of ultrasonic.The weldability of Al/Mg alloys was significantly improved due to the good material flow induced by mechanical vibration and the fragments of the IMCs on the surface of a rotating pin caused by acoustic streaming, respectively. A sound joint with ultrasonic contained long Al/Mg interface joining length and complex mixture of Al/Mg alloys in the stir zone, thereby achieving perfect metallurgical bonding and mechanical interlocking. The ultrasonic could broaden process window and then improve tensile properties. The tensile strength of the Al/Mg joint with ultrasonic reached 115 MPa. | Xiangchen Meng Yanye Jin Shude Ji Dejun Yan | 2018 | Journal of Materials Science & Technology2018，34，10： | 6 |
| 2 | A general strategy for the reliable joining of Al/Ti dissimilar alloys via ultrasonic assisted friction stir welding显示文摘Ultrasonic assisted friction stir welding(UaFSW) was used to join 6061-T6 aluminum and Ti6Al4 V alloys.A small plunge depth endowed with the low heat input was used and the sound joints without obvious thickness reduction were achieved. A diffusion-type bonding without the intermetallic compounds layer was observed at the joint interface. The ultrasonic improved the diffusion thickness and decreased the average size of grains and titanium alloy fragments. A hook-like structure was formed at the bottom interface of the UaFSW joint, which improved the bonding length and the mechanical interlocking. The microhardness of the stir zone was increased because of the further grain refinement induced by ultrasonic. The maximum tensile strength of the UaFSW joint was 236 MPa, which reached 85% of the base6061-T6 alloy. | Zhongwei Ma Yanye Jin Shude Ji Xiangchen Meng Lin Ma Qinghua Li | 2019 | Journal of Materials Science & Technology2019，35，1： | 4 |
| 3 | Modeling of protein refolding from inclusion bodies显示文摘在 Escherichia coli 的外国蛋白质的 Overexpression 经常导致包括身体(IB ) 的形成,它在 recombinant 蛋白质和他们的应用的准备成为主要瓶颈。在现在的学习,从 IB 的 36 蛋白质是用一个简单 refolding 方法的 refolded。这些蛋白质的 Refolding 收益被定义为在冲淡进 refolding 缓冲区前在样品在使中毒的蛋白质的数量跟随冲淡 refolding 的可溶的蛋白质的百分比。而且,一个数学模型被推出在蛋白质 refolding 评估生物化学的性质的角色。自从一个单位的增长在 refolding 收益导致了 14.83% 的减少,我们的结果显示在试验性的条件下面,蛋白质的等电位的点可能主要正在贡献蛋白质 refolding 的高功效。另外的重要调停人是蛋白质的部件第二等的结构和分子的重量(R2 = 0.98, P = 0.000, F-test ) 。有在蛋白质 refolding 的低效率的六蛋白质拥有了相对低的等电位的点。而且,从 IB 的六另外的蛋白质的 refolding 收益被 refolding 在一样的条件下面预言并且进一步验证了蛋白质。因此,这里开发的蛋白质 refolding 的模型能被用来通过一个简单方法从 IB 预言蛋白质的 refolding 收益。我们的学习将是暗示的根据他们的内在的性质从 IB 为蛋白质 refolding 优化方法。 | Ting Zhang Xiaojing Xu Liang Shen Yanye Feng Zhong Yang Yaling Shen Jufang Wang Weirong Jin Xiaoning Wang | 2009 | Acta Biochimica et Biophysica Sinica2009，41，12： | 2 |
| 4 | Numerical simulation of effect of rotational tool with screw on material flow behavior of friction stir welding of Ti6Al4V alloy显示文摘The rotational tool is put forward, which is composed of the one-spiral-flute shoul-der and the rotational pin with screw. Using the turbulent model of the FLUENT software, material plastic flow behavior during the process of friction stir welding of Ti6Al4V alloy is researched by the numerical simulation method and then the effect of rotational tool geometry on material flow during the welding process is attained. The results show that the flow direction of the material near the rotational tool is mainly the same as the rotational direction of the tool while the material near tool flows more violently than the other regions. For the tapered rotational pin, the flow velocity of material inside the workpiece decreases with the increase of the distance away from the workpiece surface because of the change of pin diameter. For the rotational tool, the flute added to the shoulder and the screw added to the pin can greatly increase the flow velocity of material during the welding process while the peak value of the flow velocity of material appears on the flute or the screw. Moreover, the rotational tool with the one-spiral-flute shoulder is better than the tool with the concentric-circles-flute shoulder. Decreasing the width of pin screw and increasing the diameter of pin tip are both good for the increase of flow velocity. | Shude JI Aili ZOU Yumei YUE Guohong L UAN Yanye JIN Fu LI | 2012 | Acta Metallurgica Sinica(English Letters)2012，25，5： | 2 |
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