(北京科技大学 材料科学与工程学院，北京100083)
摘 要:
关键字: CuAlNi合金；连续定向凝固；短流程制备；柱状晶；管材
（School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract: Cu-14.3%Al-4%Ni (mass fraction) alloy pipes were prepared by vacuum melting and argon-shield vertical continuous unidirectional solidification process. The effects of process parameters on the solidification forming were investigated and the microstructure and properties of the pipes were analyzed. The results show that Cu-14.3%Al-4%Ni alloy pipes with 10 mm in diameter and 1.8 mm in thickness，smooth surface and continuous columnar crystal structure can be continuously and stably fabricated under melting temperature 1 280 ℃, drawing speed 38 mm/min and cooling water flow rate 900 L/h. Cu-14.3%Al-4%Ni alloy pipes with tensile strength of 540 MPa and elongation of 13.7% show excellent mechanical properties.
Key words: CuAlNi alloy; continuous unidirectional solidification; compact processing; columnar crystals; pipe
