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5. Tension-compression asymmetry of temperature dependencies in Mg rare-earth alloys

Author

Li Jingli, Wu Di, Han Xiuzhu, Wen Chen, Chen Rongshi, and Xue Zhiyong

Subjects
Rare-earth magnesium alloys, Mechanical behavior, Loading path, Anomalous temperature and strain rate effects, Twinning behavior, Mining engineering. Metallurgy, TN1-997
Abstract

To reveal the tension-compression asymmetry of temperature-dependency in Mg-RE alloys, uniaxial tensile and compression tests followed by microstructural characterizations were performed on a cast Mg-10Gd-3Y-0.5Zr (wt.%) alloy under various temperatures. The results show that this alloy exhibits anomalous temperature effects on mechanical properties (such as tensile strength and plasticity) during tension, while they are not observed during compression tests, demonstrating that the anomalous temperature effects exhibit loading path dependence. The tension-compression asymmetry of the anomalous temperature-dependency associated with variations in twinning. It is believed that these variations in twinning result from the interplay between the inhibitory effect of rare earth elements on twinning and the promoting effects of elevated temperature or a change in the loading path from tension to compression, with the loading path having a stronger promoting influence than the deformation temperature.

Published
2023
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41. Orthogonal tests of copper-clad aluminum bimetal continuous casting by nitrogen pressure core-filling

Author

Xue Zhiyong, Liang He, and Yu Wanhua

Subjects
copper-clad aluminum, nitrogen pressing, continuous casting, orthogonal test, Technology, Manufactures, TS1-2301
Abstract

To provide theoretical basis and practical guidance for preparing composite rods by direct continuous casting, copper-clad aluminum composite rods of external copper layer diameter 12 mm and inner aluminum core diameter 8 mm were manufactured. Orthogonal tests consisted of three factors and three levels were carried out to research the effects of melting copper temperature, continuous casting speed and nitrogen pressure on the performance of composite rods. Results showed that nitrogen pressure is the most important factor in influencing the surface quality; continuous casting speed is the most important factor in influencing copper & aluminum inter diffusion amount. Nitrogen pressure can noticeably improve the surface quality and make the rods easily be drawn out, but the surface quality does not show visible improvement when the nitrogen pressure is above 0.05 MPa. Measured by tests, the compound layer can be divided into three types according to its cladding layer degree: deficient cladding, normal cladding and excess cladding. The diameter of normal copper-clad aluminum composite rods can be successfully drawn less than 0.6 mm without annealing.

Published
2013

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