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H.Higuchi, J.Kaneko and M.Sugamata: J.Japan Inst.Metals, 60-12(1996), p.1207. Hardness changes of the extruded Al-Mg-oxide composites after heating at various temperatures for 7.2ks are shown in Fig.9. In as-extruded state, the Al-Mg-B2O3 composite showed the highest hardness of 237HV. The extruded composites of Al-Mg-oxide showed generally higher hardness than those of Al-Mg-silicide. The hardness of the composites was relatively unchanged after heating up to
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