Microstructure and Mechanical Properties of A7075 Alloy with Additional Si Objects Fabricated by Selective Laser Melting

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  • OTANI Yuki
    Dept. Mechanical Engineering, Graduate School of Tokyo University of Science
  • KUSAKI Yuji
    Dept. Mechanical Engineering, Graduate School of Tokyo University of Science
  • ITAGAKI Kazuyuki
    HAKUDO Co., Ltd.
  • SASAKI Shinya
    Dept. Mechanical Engineering, Faculty of Engineering, Tokyo University of Science

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  • Selective Laser Meltingにより作製したSi添加A7075造形物の組織と機械的強度
  • Selective Laser Melting ニ ヨリ サクセイ シタ Si テンカ A7075 ゾウケイブツ ノ ソシキ ト キカイテキ キョウド

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Abstract

<p>Recently, the realization of the combination of selective laser melting (SLM) and high-strength aluminium alloys (Al alloys) has been discussed in mainly the aerospace industry. However, there have been several problems for the realization, and the one of fundamental problem is the occurrence of microcracks in high-strength Al alloy objects fabricated by SLM. To solve the problem, some researchers have studied addition of alloying elements to high-strength Al alloy. In this study, we focused on the A7075 alloy with additional five percent Si (A7075+5Si) and investigated the effects of the Si addition on the processability, microstructure and mechanical properties. As a result, it was observed that the addition of Si element inhibited the formation of cracks in the A7075 objects. Our result suggests the high density and crack-free A7075+5Si objects had higher mechanical properties than the case of a conventional Al alloy (AlSi10Mg and AlSi12). However, the T6 heat treatment (After solution treatment, water quenching and artificially ageing) did not increase the mechanical properties of A7075+5Si objects. In order to obtain the A7075+5Si objects with higher strength, it is required that the further studies about suitable heat treatment conditions for A7075+5Si alloy.</p>

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