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The Al-based ex situ and in situ composites are fabricated by totally same staring materials. No pore was observed on their cross sections. The fabricated Al-based ex situ and in situ composites are reactive hot pressed with continuously applied pressure of 60 MPa at 620 and 700°C for 5 min respectively. The reactive hot pressed ex situ composites contain homogeneously distributed metal oxides such as ZrO2, Ta2O5, Nb2O5, WO3 and MoO3 with nano or submicron sizes. On the other hands, the reactive hot pressed in situ composites contain homogeneously distributed θ-Al2O3 and intermetallic compounds such as Al3Zr, Al3Ta, Al3Nb, Al5W, Al12W and Al12Mo. It was found that the ex situ composites have a limited range of the mechanical properties such as Young’s modulus and hardness even they contain homogeneously distributed metal oxide particulates with nano or submicron sizes. However, the reactive hot pressed in situ composites present relatively various range of the mechanical properties. It was experimentally confirmed that the in situ composites fabricated by the reactive hot pressing technique is useful for fabricating a high performance structural materials.

materials transactions

Fabrication and Mechanical Properties of Al-Based &lt;i&gt;In Situ&lt;/i&gt; Nano-Composites Reinforced by Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; and Intermetallic Compounds