Solid-state reaction in mechanically milled and spark plasma sintered Al–B₄C composite materials

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• 作者：Masahiro Kubota
• 关键词：Metal matrix composites ; Mechanical alloying ; Phase transitions ; X-ray diffraction ; Spark plasma sintering
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：504
• 期：Supplement 1
• 页码：S319-S322
• 全文大小：313 K

文摘

Air-atomised pure aluminium powder with additions of 12.5 at % , 37.5 at % and 62.5 at % of B₄C was mechanically alloyed (MAed) by using a vibrational ball mill, and MAed powders were consolidated into bulk materials by a spark plasma sintering (SPS) process. Solid-state reactions of the MAed powders during heat treatments were examined by X-ray diffraction (XRD), and mechanical properties of the MAed powder obtained under various heat treatment conditions and those of the SPS materials were evaluated by hardness tests. The solid-state reactions occurred among pure aluminium, B₄C and stearic acid, added as a process control agent (PCA), after heating at 673 K to 873 K for 24 h to form AlB10, Al3BC and γ-Al2O3. The products obtained by solid-state reactions have affected the Vickers microhardness of the heat-treated MAed powders. The near full density was obtained for the SPS materials under the conditions of an applied pressure of 49 MPa at 873 K for 1 h. The Al–12.5B₄C SPS material from 16 h MAed powder exhibited the highest hardness value of 210 HV in the as-fabricated state.