Effects of ball milling and high-pressure torsion for improving mechanical properties of Al-Al2O3 nanocomposites
Effects of ball milling and high-pressure torsion for improving mechanical properties of Al-Al2O3 nanocomposites
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DOI：
10.1007/s10853-012-6679-5
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发表时间：
2012-11-01
影响因子：
4.5
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
--
作者：
Ashida, Maki;Horita, Zenji
将纯Al粉末与30%体积分数的具有类似于30 nm的粒度的Al 2 O3粉末混合。首先对混合粉末进行球磨（BM），然后在室温下在3GPa的压力下通过高压扭转（HPT）固结10圈。BM + HPT（BM + HPT）制备的Al-Al_2 O_3复合材料中，纳米Al_2 O_3颗粒在Al基体中的分散更均匀。BM + HPT复合材料的硬度值高于不含BM的复合材料。结果表明，使用BM粉末的HPT是更有效地实现均匀分散的纳米尺寸的Al 2 O3颗粒，并在改善Al-Al 2 O3纳米复合材料的机械性能。
Pure Al powders were mixed with a 30 % volume fraction of Al2O3 powders having particle sizes of similar to 30 nm. The mixed powders were first subjected to ball milling (BM) and thereafter consolidated by high-pressure torsion (HPT) at room temperature under a pressure of 3 GPa for 10 turns. The Al-Al2O3 composite produced by BM and HPT (BM + HPT) had a more uniform dispersion of the nano-sized Al2O3 particles in the Al matrix. Hardness values of the BM + HPT composites were higher than those of the composites without BM. It is shown that the use of BM powders for HPT is more effective in achieving a uniform dispersion of the nano-sized Al2O3 particles and in improving mechanical properties of the Al-Al2O3 nanocomposites.