Strengthening mechanisms in an Al-Fe-Cr-Ti nano-quasicrystalline alloy and composites
Strengthening mechanisms in an Al-Fe-Cr-Ti nano-quasicrystalline alloy and composites
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DOI：
10.1016/j.msea.2016.07.007
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发表时间：
2016-08
期刊：
影响因子：
6.4
通讯作者：
S. Pedrazzini;M. Galano;F. Audebert;D. Collins;F. Hofmann;B. Abbey;A. Korsunsky;M. Lieblich;A. Escorial;G.D.W. Smith
中科院分区：
文献类型：
--
作者：
S. Pedrazzini;M. Galano;F. Audebert;D. Collins;F. Hofmann;B. Abbey;A. Korsunsky;M. Lieblich;A. Escorial;G.D.W. Smith
本文研究了高强度Al 93 Fe 3Cr 2 Ti 2纳米准晶合金及含10和20vol%纯Al纤维的复合材料的组织-加工-性能关系。几种不同的强化机制的叠加贡献已建模分析使用的数据从系统表征的整体合金棒。观察到的屈服强度为544 MPa已被证实从固溶强化，加工硬化，沉淀硬化和Hall-Petch晶粒尺寸依赖的效果的组合。这些材料已经被其他作者在先前发表的工作中显示出对制造它们的粉末中的颗粒的尺寸分布以及随后的热机械加工条件高度敏感。在本研究中采用的工艺条件提供了微米级的晶粒与强烈的[111]择优取向沿着挤出方向和双峰尺寸分布的二十面体纳米准晶沉淀物。两者均被认为是观察到的高屈服强度的重要贡献者。纯铝纤维的加入使复合材料的屈服强度随铝含量的增加而线性下降，并提高了复合材料的塑性。
We report a study of the structure-processing-property relationships in a high strength Al93Fe3Cr2Ti2nano-quasicrystalline alloy and composites containing 10 and 20 vol% ductilising pure Al fibres. The superimposed contributions of several different strengthening mechanisms have been modelled analytically using data obtained from systematic characterisation of the monolithic alloy bar. An observed yield strength of 544 MPa has been substantiated from a combination of solid solution strengthening, work hardening, precipitation hardening and Hall-Petch grain size dependent effects. These materials have been shown by other authors in previous published work to be highly sensitive to the size distribution of particles in the powder from which they are made, and the subsequent thermomechanical processing conditions. The processing condition employed in this study provided micron-sized grains with a strong [111] preferential orientation along the extrusion direction and a bimodal size distribution of the icosahedral nano-quasicrystalline precipitates. Both were deemed to be a significant contributor to the high yield strength observed. The addition of pure Al fibres was found to decrease the yield strength linearly with increasing Al content, and to augment the ductility of the composites.