Nanoindentation of Al2O3/Al2TiO5 composites: Small-scale mechanical properties of Al2TiO5 as reinforcement phase
Nanoindentation of Al2O3/Al2TiO5 composites: Small-scale mechanical properties of Al2TiO5 as reinforcement phase
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DOI：
10.1016/j.jeurceramsoc.2012.05.034
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发表时间：
2012-11-01
影响因子：
5.7
通讯作者：
Llanes, L.
中科院分区：
文献类型：
--
作者：
Botero, C. A.;Jimenez-Pique, E.;Llanes, L.
采用纳米压痕法对氧化铝/钛酸铝复合材料（Al 2 O3/Al 2 TiO 5）的力学性能进行了测试和分析。采用不同的压痕深度，结合互补的表征技术，对试件上的残留压痕进行了定位和观察。复合材料的机械响应被认为是由氧化铝和钛酸铝的晶粒尺寸，从压痕进行评价，在1500 nm的穿透深度。另一方面，在个别晶粒允许小凹痕，以评估硬度以及通过实施不同的分析压痕模型的非裂纹颗粒的Al 2 TiO 5的弹性模量。通过与混合物规则预测值的临界比较，验证了局部力学性能的获得值。结果表明，没有证据的增强相的颗粒上的所有测试的复合材料，之前和之后的低渗透深度压痕的微裂纹。Al 2 TiO 5的弹性模量被认为是高于散装钛酸铝上报告的值，大概是因为没有微裂纹的小晶粒尺寸。散装复合材料的机械响应最后讨论的基础上的贡献，从那些个别阶段。(C)2012爱思唯尔有限公司保留所有权利。
The mechanical properties of alumina/aluminum titanate composites (Al2O3/Al2TiO5) were evaluated and analyzed by nanoindentation. Indentations with different penetration depths were performed, and residual imprints on specimens were located and observed by combining complementary characterization techniques. The mechanical response of composites was found to be determined by grain size of alumina and aluminum titanate, as evaluated from indentations performed at 1500 nm of penetration depth. On the other hand, small indents in individual grains permitted to assess the hardness as well as the elastic modulus of non-cracked particles of Al2TiO5 through implementation of different analytical indentation models. The attained values for the local mechanical properties were validated through critical comparison of them with those predicted by the rule of mixtures. Results showed no evidence of microcracicing on grains of the reinforcing phase for all the tested composites, before and after low penetration depth indentations. Elastic modulus of Al2TiO5 was found to be higher than the values reported on bulk aluminum titanate, presumably because of the absence of microcracking for small grain sizes. The bulk composite mechanical response is finally discussed on the basis of contributions from those of the individual phases. (C) 2012 Elsevier Ltd. All rights reserved.