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Acta Metall Sin  2012, Vol. 48 Issue (7): 867-874    DOI: 10.3724/SP.J.1037.2012.00187
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MICROSTRUCTURE AND MECHANICAL PROPERTIES EVOLUTIONS OF CONTINUOUS COLUMNAR-GRAINED CuAlNi ALLOY WIRES DURING DIELESS DRAWING PROCESS
WANG Zhen, LIU Xuefeng, XIE Jianxin
Key Laboratory for Advanced Materials Processing (MOE), University of Science and Technology Beijing, Beijing 100083
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Abstract  Dieless drawing experiments of continuous columnar-grained Cu-14.0%Al-3.8%Ni (mass fraction) alloy wires were carried out at drawing speeds of 0.8-1.1 mm/s and deformation temperatures of 650-900 ℃, when the feeding speed and distance between the heating and the cooling sources kept invariant at 0.50 mm/s and 15 mm, respectively. Effects of dieless drawing parameters on the microstructure and mechanical properties of the alloy were investigated, and the mechanism of microstructure and mechanical properties evolutions of the deformed alloy was discussed. It was found that the straight continuous columnar-grained boundaries of the alloy wires evolved into regular small zigzag, disordered large zigzag and recrystallized boundaries. When the deformation temperature was 650 ℃ and the drawing speed was 0.8 and 0.9 mm/s, the alloy remained continuous columnar grains with straight boundaries after dieless drawing, while the straight columnar-grained boundaries gradually transformed into zigzag boundaries with the deformation temperature and drawing speed increasing. When the drawing speed was 0.9 mm/s and the deformation temperature up to 850 ℃, the alloy exhibited obviously incomplete dynamic recrystallized microstructure characteristic, $i.e$. the original columnar grains were elongated along the deformation direction, and small dynamic recrystallized grains generated at parts of zigzag grain boundaries. The alloy occurred complete dynamic recrystallization at the deformation temperature of 900 ℃, and the deformed columnar grains were completely replaced by numerous equiaxed dynamic recrystallized grains with larger size. The tensile strengths of the alloy after dieless drawing first showed a very modest increase trend and then decreased greatly, while the elongations kept decrease.
Key words:  Cu-Al-Ni alloy      continuous columnar grain      dieless drawing      dynamic recrystallization      microstructure and mechanical property     
Received:  10 April 2012     
ZTFLH: 

TG146.1

 
Fund: 

National Natural Science Foundation of China

Corresponding Authors:  Xue-Feng LIU     E-mail:  liuxuefengbj@163.com

Cite this article: 

WANG Zhen LIU Xuefeng XIE Jianxin. MICROSTRUCTURE AND MECHANICAL PROPERTIES EVOLUTIONS OF CONTINUOUS COLUMNAR-GRAINED CuAlNi ALLOY WIRES DURING DIELESS DRAWING PROCESS. Acta Metall Sin, 2012, 48(7): 867-874.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00187     OR     https://www.ams.org.cn/EN/Y2012/V48/I7/867

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