喷射成形制备La62Al15.7(Cu,Ni)22.3块体非晶合金

Preparation of a La62Al15.7(Cu,Ni)22.3 bulk amorphous alloy by spray forming

  • 摘要: 采用喷射沉积成形方法制备了La62Al15.7(Cu,Ni)22.3块体非晶合金.结果表明,沉积态La62Al15.7(Cu,Ni)22.3非晶合金比以往报道的采用甩带法制备的同成分非晶合金具有更大的约化玻璃转变温度和更宽的过冷液相区.非晶的晶化实验表明,晶化初期多种晶相同时结晶析出.483K退火时,在非晶基体中析出Al和AlNi.503K退火时进一步析出La和未知相.La62Al15.7(Cu,Ni)22.3非晶合金在573K退火没有新相产生,合金晶化态组织由Al、AlNi、La和未知相组成.

     

    Abstract: A La62Al15.7(Cu,Ni)22.3 bulk amorphous alloy was prepared by spray forming. Experimental results show that the reduced glass transition temperature and super-cooled liquid region of the La62Al15.7(Cu,Ni)22.33 bulk amorphous alloy prepared by spray forming are larger than those of the melt-spun alloy with the same composition reported previously. The crystallization behavior of the as-deposited alloy was investigated by DSC and XRD in order to reveal characteristics of this technique. It shows that several phases precipitate simultaneously during the early crystallization process. When annealed at 483 K, Al and AlNi precipitates from the amorphous matrix, while La and certain unknown phase appear subsequently when the annealing temperature is 503 K. No other phase precipitates from the matrix when the alloy is annealed at 573 K. The microstructure of the crystallized sample consists of Al, AlNi, La and a kind of unknown phase.

     

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