摘要
在AZ91B镁合金中加入TiB_(2)颗粒作为增强体,通过电磁搅拌处理方式对其进行凝固处理,测试了不同电流下的TiB_(2)/AZ91B镁合金的微观组织及力学性能。研究结果表明:电磁搅拌并没有改变合金的物相组成。电磁搅拌下合金生成了许多粗大的多边形TiB_(2)颗粒,发生了较大程度的团聚。通过增大电流的方式来获得更多小尺寸颗粒。低硬度区域位于下部,基本都在64~67 HV。更高部位的硬度也明显增大,顶部硬度达到了68~70 HV的较高值。电磁搅拌有效减小了不同高度部位的硬度差异性。电磁搅拌后可以实现合金屈服强度以及断裂应变性能的提升。随着电磁搅拌电流的增加,强度表现出先增加后减小的变化规律,最大值发生在电流200 A时,此时抗拉强度为262 MPa、屈服强度为182 MPa。
The microstructure and mechanical properties of AZ91B magnesium alloy under different current were tested by adding TiB_(2)particles as reinforcement and solidification treatment by electromagnetic stirring.The results show that the electromagnetic stirring does not change the phase composition of the alloy.Under electromagnetic stirring,a lot of thick polygon TiB_(2)particles are formed,and a large degree of agglomeration occurs.More small-size particles are obtained by increasing the current.The low hardness zone is located at the lower part,which is generally in the range of 64-67 HV.The hardness of the higher parts also increases obviously,and the hardness of the top reaches a higher value of 68-70 HV.Electromagnetic stirring effectively reduces the hardness difference of different heights.The yield strength and fracture strain properties of the alloy can be improved after electromagnetic stirring.With the increase of electromagnetic stirring current,the strength increases first and then decreases,and the maximum value occurs at the current of 200 A,when the tensile strength is 262 MPa and yield strength is 182 MPa.
作者
贾耀申
段改庄
李军
白玲
贾妙娟
徐园园
张拴棚
JIA Yaoshen;DUAN Gaizhuang;LI Jun;BAI Ling;JIA Miaojuan;XU Yuanyuan;ZHANG Shuanpeng(Shijiazhuang Changfeng Environmental Engineering Co.,Ltd.,Shijiazhuang 450000,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 450000,China)
出处
《热加工工艺》
北大核心
2022年第18期72-75,共4页
Hot Working Technology
基金
国家自然科学基金项目(51775157)。
关键词
镁合金
电磁搅拌
TiB_(2)颗粒
硬度
强度
magnesium alloy
electromagnetic stirring
TiB_(2)particle
hardness
strength
