High-strength and ductile ultrafine-grained Al-Y-Ni-Co alloy for high-temperature applications

作者：He, Tianbing^*; Chen, Shuangjian; Lu, Tiwen; Zhao, Panpan; Chen, Weiping; Scudino, Sergio^*

来源：Journal of Alloys and Compounds, 2020, 848: 156655.

DOI：10.1016/j.jallcom.2020.156655

• Ultrafine-grained aluminum
• Al-based metallic glass
• High temperature aluminum alloy
• Mechanical properties

Ultrafine-grained Al90.4Y4.4Ni4.3Co0.9 was synthesized by powder metallurgy from partially-amorphous powder precursors. A good combination of mechanical properties was obtained by optimizing size and density of second phases. The resultant alloy shows high specific strength and specific modulus as well as a tensile ductility of similar to 5% at room temperature. Particularly, this alloy exhibits good mechanical stability at elevated temperature, which is superior to most high-temperature aluminum alloys. These results provide evidence for the effectiveness of Al-based metallic glasses as precursors for the development of high-temperature aluminum alloys.

• 单位
  中国科学院