Stress-induced damage evolution in cast AlSi12CuMgNi alloy with one- and two-ceramic reinforcements. Part II: effect of reinforcement orientation
Stress-induced damage evolution in cast AlSi12CuMgNi alloy with one- and two-ceramic reinforcements. Part II: effect of reinforcement orientation
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DOI：
10.1007/s10853-019-04069-4
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发表时间：
2020-01-01
影响因子：
4.5
通讯作者：
Bruno, G.
中科院分区：
文献类型：
--
作者：
Evsevleev, S.;Cabeza, S.;Bruno, G.
虽然有大量的文献对金属基复合材料（MMCs）的单轴应力下的微观力学行为，很少有多相MMCs。为了揭示这种多相复合材料的增强机理和损伤过程，研究了由铝基活塞合金制成的含有单陶瓷增强体和双陶瓷增强体（平面随机取向氧化铝纤维和SiC颗粒）的材料。在中子衍射实验过程中的原位压缩试验被用来跟踪各相之间的载荷传递，而预应变样品的X射线计算机断层扫描被用来监测和量化损伤。我们发现，不同方向的纤维毡复合材料的损伤进展不同。由于金属间网络的存在，观察到第二陶瓷增强体仅在非常高的施加载荷下改变载荷传递情况，此时金属间颗粒也断裂。我们合理化目前的结果结合他们与以前的调查，并使用一个微观力学模型。
While there is a large body of literature on the micromechanical behavior of metal matrix composites (MMCs) under uniaxial applied stress, very little is available on multi-phase MMCs. In order to cast light on the reinforcement mechanisms and damage processes in such multi-phase composites, materials made by an Al-based piston alloy and containing one- and two-ceramic rein-forcements (planar-random oriented alumina fibers and SiC particles) were studied. In situ compression tests during neutron diffraction experiments were used to track the load transfer among phases, while X-ray computed tomography on pre-strained samples was used to monitor and quantify damage. We found that damage progresses differently in composites with different orientations of the fiber mat. Because of the presence of intermetallic network, it was observed that the second ceramic reinforcement changed the load transfer scenario only at very high applied load, when also intermetallic particles break. We rationalized the present results combining them with the previous investigations and using a micromechanical model.