Microstructure and properties of Al3Zr/2024Al in situ composites after forging
来源期刊：Rare Metals2016年第12期
论文作者：Lei Jiao Yu-Tao Zhao Jian-Chao Chen Long Chen
文章页码：920 - 925
摘 要：To research the influencing rule of severe plastic deformation on Al matrix in situ composites,10 wt% Al3Zr/2024 Al in situ particle-reinforced composite was prepared by direct melt reaction（DMR）, and then, the composite was hot-forged by one direction with 90 % plastic deformation. Then, the microstructure of the forging state composite was observed, and the change law of mechanical properties and friction performances after and before plastic deforming was compared. The results indicate that theAl3Zr-reinforced particle rotates and breaks into smaller size of 10–20 lm with the matrix flow; in addition, these smaller particles distribute more orderly in orientation and dispersedly. The 2024 matrix grain changes from as-cast tissue to fibrous tissue with length of 100 lm along the forging direction. Some mechanical properties of composites hot-forged by one direction with 90 % plastic deformation are improved much obviously. For example,the tensile strength is improved by 39.75 %, reaching 225 MPa, and the hardness is improved by 35.84 %,reaching HBW 76.83. Besides, the wear rate reduces, wear depth and area decline, and the wear-resisting property is improved after hot forging.
Lei Jiao，Yu-Tao Zhao，Jian-Chao Chen，Long Chen
School of Materials Science and Engineering,JiangsuUniversity
摘 要：To research the influencing rule of severe plastic deformation on Al matrix in situ composites,10 wt% Al3Zr/2024 Al in situ particle-reinforced composite was prepared by direct melt reaction（DMR）, and then, the composite was hot-forged by one direction with 90 % plastic deformation. Then, the microstructure of the forging state composite was observed, and the change law of mechanical properties and friction performances after and before plastic deforming was compared. The results indicate that theAl3Zr-reinforced particle rotates and breaks into smaller size of 10–20 lm with the matrix flow; in addition, these smaller particles distribute more orderly in orientation and dispersedly. The 2024 matrix grain changes from as-cast tissue to fibrous tissue with length of 100 lm along the forging direction. Some mechanical properties of composites hot-forged by one direction with 90 % plastic deformation are improved much obviously. For example,the tensile strength is improved by 39.75 %, reaching 225 MPa, and the hardness is improved by 35.84 %,reaching HBW 76.83. Besides, the wear rate reduces, wear depth and area decline, and the wear-resisting property is improved after hot forging.
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