EFFECT OF MELT OVER-HEATING AND ZIRCONIUM ALLOYING ON THE MORPHOLOGY OF Al9FeNi PHASE AND MECHANICAL PROPERTIES OF 2618 ALLOY
来源期刊：Acta Metallurgica Sinica2002年第6期
论文作者：J.H.Wang D.Q.Yi
Key words：melt over-heating; 2618 alloy; zirconium alloying; morphology ofAl9FeNi phase; mechanical property;
Abstract: The effect of melt over-heating on the morphology of Al9FeNi phase in 2618 aluminumalloy with high contents of Fe and Ni and 0.22wt.% zirconium has been investigatedby optical microscopy, SEM and TEM. The mechanical properties of 2618 aluminumalloy after hot extrusion and quenching/aging have been tested. The results show:melt over-heating treatment of 2618 alloy with high contents of Fe and Ni at 960° Cled to finer and better-distributed needle-like Al9FeNi phase in cast microstructureand fine Al9FeNi particles after hot extrusion; the grain size of the alloy after hotextrusion could also be refined evidently by alloying of zirconium; the ambient andhigh temperature tensile strength and elongation of 2618 alloy have been apparentlyenhanced due to fine Al9FeNi particles and dispersed Al3Zr as well as fine grain size.
J.H.Wang1，D.Q.Yi2
(1.Mechanical Engineering Institute of Xiangtan University, Xiangtan 411105, China;
2.Department of Materials Science and Technology of Central South University, Changsha 410083, China)
Abstract:The effect of melt over-heating on the morphology of Al9FeNi phase in 2618 aluminumalloy with high contents of Fe and Ni and 0.22wt.% zirconium has been investigatedby optical microscopy, SEM and TEM. The mechanical properties of 2618 aluminumalloy after hot extrusion and quenching/aging have been tested. The results show:melt over-heating treatment of 2618 alloy with high contents of Fe and Ni at 960° Cled to finer and better-distributed needle-like Al9FeNi phase in cast microstructureand fine Al9FeNi particles after hot extrusion; the grain size of the alloy after hotextrusion could also be refined evidently by alloying of zirconium; the ambient andhigh temperature tensile strength and elongation of 2618 alloy have been apparentlyenhanced due to fine Al9FeNi particles and dispersed Al3Zr as well as fine grain size.
Key words:melt over-heating; 2618 alloy; zirconium alloying; morphology ofAl9FeNi phase; mechanical property;
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