Microstructural evolution during heating of CNT/Metal Matrix Composites processed by Severe Plastic Deformation
Microstructural evolution during heating of CNT/Metal Matrix Composites processed by Severe Plastic Deformation
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DOI：
10.1038/s41598-020-57946-3
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发表时间：
2020-01-21
影响因子：
4.6
通讯作者：
Suarez, Sebastian
中科院分区：
文献类型：
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作者：
Aristizabal, Katherine;Katzensteiner, Andreas;Suarez, Sebastian
采用固相法制备了不同碳纳米管含量的碳纳米管增强镍基复合材料（Ni/CNT）。利用差示扫描量热法（DSC）、高温X射线衍射（HT-XRD）和电子背散射衍射（EBSD）对样品在加热过程中的微观结构变化和热稳定性进行了深入研究。此外，通过DSC和HT-XRD证明了在复合材料中亚稳态碳化镍Ni 3C相的形成和溶解，其中足够的碳原子是可用的，作为HPT引入的CNT上的不可逆损伤的结果。最后，结果表明，相对于在相同条件下加工的镍样品，复合材料表现出改善的热稳定性，根据V-CNT（-1/3）关系，最终晶粒尺寸取决于CNT体积分数，并且位于超细晶粒范围内。
Carbon nanotube reinforced nickel matrix composites (Ni/CNT) with different CNT compositions were fabricated by solid state processing and subjected to severe plastic deformation (SPD) by means of high pressure torsion (HPT). A thorough study on the microstructural changes during heating and on the thermal stability was performed using differential scanning calorimetry (DSC), high temperature X-ray diffraction (HT-XRD) and electron backscattered diffraction (EBSD). Furthermore, the formation and dissolution of the metastable nickel carbide Ni3C phase was evidenced by DSC and HT-XRD in composites, where sufficient carbon atoms are available, as a consequence of irreversible damage on the CNT introduced by HPT. Finally, it was shown that the composites exhibited an improved thermal stability with respect to nickel samples processed under the same conditions, with a final grain size dependent on the CNT volume fraction according to a V-CNT(-1/3) relationship and that lied within the ultrafine grained range.