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Materials 2017, 10(11), 1234; https://doi.org/10.3390/ma10111234

Effects of Texture and Grain Size on the Yield Strength of ZK61 Alloy Rods Processed by Cyclic Extrusion and Compression

1
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
2
Department of Fundamental Experiment, Naval Aeronautical University, Yantai 264001, China
3
Weihai Wangfeng Magnesium Industry Science and Technology Develop Co. Ltd., Weihai 264209, China
*
Authors to whom correspondence should be addressed.
Received: 23 September 2017 / Revised: 11 October 2017 / Accepted: 23 October 2017 / Published: 26 October 2017
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

The ZK61 alloy rods with different grain sizes and crystallographic texture were successfully fabricated by cyclic extrusion and compression (CEC). Their room-temperature tension & compression yield strength displayed a significant dependence on grain size and texture, essentially attributed to {10-12} twinning. The texture variations were characterized by the angle θ between the c-axis of the grain and the extrusion direction (ED) during the process. The contour map of room-temperature yield strength as a function of grain size and the angle θ was obtained. It showed that both the tension yield strength and the compression yield strength of ZK61 alloy were fully consistent with the Hall-Patch relationship at a certain texture, but the change trends of the tension yield strength and the compression yield strength were completely opposite at the same grain size while texture altered. The friction stresses of different deformation modes calculated based on the texture confirmed the tension yield strength of the CECed ZK61 alloy rods, which was determined by both the basal slip and the tension twinning slip during the tension deformation at room temperature, while the compression yield strength was mainly determined by the basal slip during the compression deformation. View Full-Text
Keywords: ZK61 alloy; cyclic extrusion and compression; crystallographic texture; room-temperature yield strength; extrusion direction ZK61 alloy; cyclic extrusion and compression; crystallographic texture; room-temperature yield strength; extrusion direction
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Zhang, L.; Zhang, W.; Cao, B.; Chen, W.; Duan, J.; Cui, G. Effects of Texture and Grain Size on the Yield Strength of ZK61 Alloy Rods Processed by Cyclic Extrusion and Compression. Materials 2017, 10, 1234.

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