AlNiY chill-zone alloys with good mechanical properties

作者：Li Yan; Georgarakis Konstantinos; Pang Shujie; Antonowicz Jerzy; Charlot Frederic; LeMoulec Alain; Zhang Tao; Yavari Alain Reza

来源：Journal of Alloys and Compounds, 2009, 477(1-2): 346-349.

DOI：10.1016/j.jallcom.2008.09.160

• Chill-zone alloy
• Al-Ni-Y
• Metastable phase
• Mechanical property
• HRSEM

Using cold graphite mold casting method, Al-based chill-zone alloys cylinders of millimeter scale thickness [Y. Li, K. Georgarakis, S.J. Pang, A. LeMoulec, T. Zhang, A.R. Yavari, unpublished research] were prepared. Using high-resolution scanning electron microscopy (HRSEM), it was found that hard submicron crystalline surface layers of thickness about 200 mu m form when the melt can be undercooled. The structure and the thermal properties of the chill-zone alloy were examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). A metastable phase Al(19)Ni(5)Y(3) nucleated during cooling then transformed to equilibrium intermetallics after annealing. The chill-zone alloy shows high mechanical strength in excess of 1 GPa at high ambient temperatures and good plasticity.

• 出版日期2009-5-27
• 单位北京航空航天大学