Effect of Modification on Mechanical Behavior of ZA303 under High Temperature

Abstract:

In this paper , by SEM、EDS、XRD and Shimadzu AG-I250KN precision universal testing machine , the metallurgical structure, fracture appearance, the mechanical properties of the ZA303 under high temperature were systematically studied .The results shows that :The microstructure of ZA303 at room temperature are : α phase + (α＋η) _eutectoid + ε phase + η phase. After adding modifying elements B、Ti in ZA303：the microstructure of the alloy is from gross dendrites to uniform equiaxed grains , the quantity, morphology and distribution of the (α + η) have greatly change: the quantity of (α + η) is less, from a continuous network to intermittent block, and its end become blunt, or even cylindrical horn and dispersed distribution; on the grain boundary, the size of ε phase become smaller and dispersed distribution, the number of mesh ε phase reduced but intermittent strips increased; adding B、Ti have a good effect of restraining Al element segregation，so the foundry defects decreased obviously. In the range of experimental temperature, the increase of ductility is large while the tensile strength is small: at the same time, the mechanical performances stability is better than that without modification.

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 1079-1082
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.1079
• Online since: December 2011
• Authors: Dou Qin Ma, Jing Pei Xie, W.Y. WANG
• Keywords: High Temperature Mechanical Properties, Metallurgical Structure, Modification, ZA303

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