Unique mechanical properties of nanostructured metals.
Unique mechanical properties of nanostructured metals.
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DOI：
10.1166/jnn.2007.18068
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发表时间：
2007-11
影响因子：
--
通讯作者：
N. Tsuji
中科院分区：
文献类型：
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作者：
N. Tsuji
近来，制造具有超细晶粒或纳米晶体结构的块体金属成为可能，所述结构的晶粒尺寸为纳米尺寸。实现大块纳米结构金属的一个有前途的方法是在对数等效应变为4以上的剧烈塑性变形（SPD）。我们已经开发出一种新颖的SPD工艺，称为累积轧制键合（ARB），原则上使用轧制变形，并成功地制造了各种金属和合金的大块纳米结构片材。本文介绍了ARB工艺及其制备的纳米金属结构。纳米结构的金属有时表现出相当独特的机械性能，这与常规的粗晶粒材料相比是相当令人惊讶的。这些独特的性能可能是由于纳米金属具有充满晶界的特征结构。
Recently, it becomes possible to fabricate bulk metals having ultrafine grained or nanocrystalline structures of which grain size is in nano-meter dimensions. One of the promising ways to realize bulk nanostructured metals is severe plastic deformation (SPD) above logarithmic equivalent strain of 4. We have developed an original SPD process, named Accumulative Roll Bonding (ARB) using rolling deformation in principle, and have succeeded in fabricating bulk nanostructured sheets of various kinds of metals and alloys. The ARB process and the nanostructured metals fabricated by the ARB are introduced in this paper. The nanostructured metals sometimes perform quite unique mechanical properties, that is rather surprising compared with conventionally coarse grained materials. The unique properties seem to be attributed to the characteristic structures of the nano-metals full of grain boundaries.