Microstructure and mechanical behavior of metallic glass fiber-reinforced Al alloy matrix composites.
Microstructure and mechanical behavior of metallic glass fiber-reinforced Al alloy matrix composites.
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DOI：
10.1038/srep24384
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发表时间：
2016-04-12
影响因子：
4.6
通讯作者：
Yavari AR
中科院分区：
文献类型：
--
作者：
Wang Z;Georgarakis K;Nakayama KS;Li Y;Tsarkov AA;Xie G;Dudina D;Louzguine-Luzgin DV;Yavari AR
金属玻璃增强金属基复合材料是一类新兴的复合材料。增强相的金属性质和高机械强度为改善复合材料的工程性能提供了独特的可能性。了解这些复合材料的非晶/晶界面结构和变形行为对于它们的进一步发展和潜在应用是至关重要的。采用放电等离子烧结（SPS）技术在Al 7075合金（Al-Zn-Mg-Cu）基体中引入Zr基金属玻璃纤维，制备了低孔隙率的复合材料。金属玻璃增强体的加入显著改善了复合材料的压缩力学性能。在界面处的高分辨率TEM观察揭示了能够在增强相和Al基基体之间提供良好结合的薄互扩散层的形成。复合材料的变形行为进行了研究，表明局部塑性变形发生在基体附近的玻璃态增强体随后的裂纹的萌生和扩展主要通过基体。增强相被认为是抑制塑性变形和延迟裂纹扩展。这些发现为金属玻璃增强的金属基复合材料的力学行为提供了新的见解。
Metallic glass-reinforced metal matrix composites are an emerging class of composite materials. The metallic nature and the high mechanical strength of the reinforcing phase offers unique possibilities for improving the engineering performance of composites. Understanding the structure at the amorphous/crystalline interfaces and the deformation behavior of these composites is of vital importance for their further development and potential application. In the present work, Zr-based metallic glass fibers have been introduced in Al7075 alloy (Al-Zn-Mg-Cu) matrices using spark plasma sintering (SPS) producing composites with low porosity. The addition of metallic glass reinforcements in the Al-based matrix significantly improves the mechanical behavior of the composites in compression. High-resolution TEM observations at the interface reveal the formation of a thin interdiffusion layer able to provide good bonding between the reinforcing phase and the Al-based matrix. The deformation behavior of the composites was studied, indicating that local plastic deformation occurred in the matrix near the glassy reinforcements followed by the initiation and propagation of cracks mainly through the matrix. The reinforcing phase is seen to inhibit the plastic deformation and retard the crack propagation. The findings offer new insights into the mechanical behavior of metal matrix composites reinforced with metallic glasses.