Aluminum alloy for plastic working and manufacturing method thereof

Abstract

The invention provides an aluminum alloy for plastic working, which are useful for high performance members, such as automotive parts, fishing gears, golf clubs and snow boards, and has high tensile strength, high Young's modulus and high ductility, and to provide its manufacturing method. A powder mixture is prepared by mixing 10 to 25wt.% alumina with an aluminum alloy powder having a composition consisting of, by weight, 0.4 to 2.0% Si, 0.4 to 2.0% Mg, 0.5 to 2.0%, in total, of one or more elements selected from among Fe, Mn and Cr, and the balance Al with inevitable impurities. The powder mixture is compacted at room temperature, and the resultant green compact is vacuum degassed at 200 to 450[deg.]C and further sintered at a high temperature of 500 to 600[deg.]C. The resultant sintered compact is pressure sintered and then forged. By this method, a structural member as a finished product having >=80 GPa Young's modulus at room temperature, >=300 MPa tensile strength at room temperature after water quenching treatment and >=5% elongation can be obtained.

Description

technical field [0001] The present invention relates to an aluminum alloy for plastic working with high tensile strength, high Young's modulus, and high ductility, which can be used as high-performance components such as bicycle parts, fishing gear, golf gear, or snowboards and methods of manufacture thereof. Background technique [0002] In recent years, attempts have been made to add and disperse ceramics to aluminum alloy powder obtained by a rapid solidification method to improve the properties, especially the rigidity. For example, Al-high Si-based, Al-Fe-Mo-based, Al-Cu-based, Al-Si-Mg-based, or Al-Zn-Mg-based compositions have been studied (for example, refer to Patent Document 1). [0003] In addition, when the aluminum alloy is subjected to hot forming such as extrusion or forging, if the powder compact obtained by compacting has contained hydrate or air in the inside or on the surface at a low temperature before that, if the hot working is directly carried out in ...

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Problems solved by technology

[0003] In addition, when the aluminum alloy is subjected to hot forming such as extrusion or forging, if the powder compact obtained by compacting has contained hydrate or air in the inside or on the surface at a low temperature before that, if the hot working is directly carried out in this way, Defects such as blistering (expansion) may occur during thermal processing or in the subsequent heat treatment process

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