Mechanical properties of superhard nanocomposites
Mechanical properties of superhard nanocomposites
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DOI：
10.1016/s0257-8972(01)01467-0
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发表时间：
2001-09-01
影响因子：
5.4
通讯作者：
Argon, AS
中科院分区：
文献类型：
--
作者：
Veprek, S;Argon, AS
根据通用设计概念[Thin Solid Films 268，（1995）64]制备的新型超硬纳米复合材料，其基于由于强偏析和旋节分解而形成的适当纳米结构。显示出不寻常的机械性能组合，例如从40到大于或等于100 GPa的高固有（即，不被大的压缩应力伪造）维氏显微硬度。高弹性回复率（高达大于或等于90%），即使在大于或等于10%的大应变下也具有高的抗裂纹形成性，以及高的热稳定性。我们将表明，这些属性可以相对容易地理解的基础上，传统的断裂力学按比例缩小到几个纳米的小纳米晶体和纳米裂纹的尺寸，结合低浓度的可能的缺陷引入到材料在其制备过程中。后者是由于稳定的纳米结构的化学驱动形成的系统的“自组织”的结果。(C)2001 Elsevier Science B.V.保留所有权利。
Novel superhard nanocomposites prepared according to the generic design concept [Thin Solid Films 268, (1995) 64] which is based on the formation of the appropriate nanostructure due to strong segregation and spinodal decomposition. show an unusual combination of mechanical properties, such as high intrinsic (i.e. not falsified by a large compressive stress) Vickers microhardness from 40 to greater than or equal to 100 GPa. high elastic recovery (up to greater than or equal to 90%), high resistance against crack formation even at a large strain of greater than or equal to 10% and high thermal stability. We shall show that these properties can be relatively easily understood on the basis of conventional fracture mechanics scaled down to dimensions of a few nanometers small nanocrystals and nanocracks, in combination with a low concentration of possible flaws introduced into the material during its preparation. The latter is a consequence of the 'self-organization' of the system due to the thermodynamically driven formation of the stable nanostructure. (C) 2001 Elsevier Science B.V. All rights reserved.