Abnormal crystallization in Al86Ni6Y4.5Co2La1.5 metallic glass induced by spark plasma sintering

作者：Li X P; Yan M; Schaffer G B; Qian M^*

来源：Intermetallics, 2013, 39: 69-73.

DOI：10.1016/j.intermet.2013.03.013

• Intermetallics
• Glasses
• metallic
• Sintering
• Phase transformation

Abnormal crystallization was observed in Al86Ni6Y4.5Co2La1.5 metallic glass powder at about 20 degrees C below its glass transition temperature (T-g, 271.5 degrees C) during spark plasma sintering (SPS). The crystallization product, identified to be a hexagonal-structured Al5Co2 phase, was not detected in the same powder when annealed in a differential scanning calorimeter (DSC). Nor was it detected in other Al-based metallic glasses of similar compositions which were annealed around their T-g temperatures by conventional heating. SPS is effective to introduce a unique nanometric intermetallic phase in the amorphous matrix. The abnormal crystallization is attributed to the high applied pressure and non-thermal effects of SPS.

• 出版日期2013-8