多道次搅拌摩擦加工对7B04-O铝合金组织和性能的影响（英文）

发布时间：2018-02-24 08:42

本文关键词： 搅拌摩擦加工多道次晶粒细化铝合金　出处：《Transactions of Nonferrous Metals Society of China》2017年04期 　论文类型：期刊论文

【摘要】：采用不同的相邻道次搅拌头位移量对7B04-O铝合金进行三道次搅拌摩擦加工,相邻道次的搅拌头位移量分别采用传统方式(50%搅拌针直径)和新方式(50%搅拌轴肩直径)。搅拌摩擦加工引起晶粒和第二相粒子细化,加工区力学性能提高,硬度提高HV40,拉伸性能也较母材提高了40%。在加工区内部存在性能弱区,其位置受相邻道次搅拌头位移量影响,当采用传统方式的搅拌头位移量时,性能弱区为先前加工道次,而采用新方式时,性能弱区为过渡区。利用新方式制备细晶加工区时,可以通过提高搅拌头旋转速度限制性能弱区。
[Abstract]:Three pass friction stir machining of 7B04-O aluminum alloy was carried out with different displacement of adjacent pass stirring head. The displacement of agitator in adjacent passes is 50% needle diameter in traditional way and 50% in shoulder diameter in new way. Friction stir processing results in refinement of grain and second phase particles, and improvement of mechanical properties in processing zone. The hardness is increased HV40, and the tensile property is improved by 40% compared with the base metal. There is a weak performance zone within the processing zone, the position of which is affected by the displacement of the adjacent pass mixing head. When the displacement of the traditional mixing head is adopted, the weak zone of the performance is the previous machining pass. When the new method is used, the weak zone of the performance is the transition zone, and the weak region of the performance can be limited by increasing the rotating speed of the agitator when the fine crystal processing zone is prepared by the new method.
【作者单位】：东北大学材料科学与工程学院;Laboratory
【基金】：support received from the Ministry of Education and Science,Russia,(Belgorod State University project No.1533)is acknowledged support from the National Science Foundation for Young Scientists of China(No.51501035) Chinese Postdoctoral Science Foundation(No.2016T90227) supported financially by the National Natural Science Foundation of China(No.51334006)
【分类号】：TG146.21

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