In-situ investigation of tension-compression asymmetry of Ni-SiOC nanocomposites
In-situ investigation of tension-compression asymmetry of Ni-SiOC nanocomposites
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DOI：
10.1016/j.scriptamat.2022.115103
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发表时间：
2023-01
影响因子：
6
通讯作者：
B. Wei;Wen-qing Wu;Jian Wang
中科院分区：
文献类型：
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作者：
B. Wei;Wen-qing Wu;Jian Wang
通过共溅射Ni和Si-O-C合成了Ni-SiOC纳米复合材料，然后在高达800 °C的高温下退火以获得两种特征的显微结构，核心（晶态镍）壳层原位扫描电子显微镜（SEM）压缩测试表明，两种类型的Ni-（非晶陶瓷SiOC）纳米结构和亚微米晶粒的含Ni非晶陶瓷SiOC颗粒。SiOC纳米复合材料具有高强度和良好的塑性流动稳定性，这是由于非晶陶瓷和Ni颗粒之间的微结构促进的塑性共同变形。然而，原位拉伸试验表明，核-壳纳米结构表现出脆性断裂行为在低强度下，由于开裂沿着非晶核心，而亚微米晶粒的镍可以达到类似的强度，压缩，但有限的塑性，由于界面脱粘促进镍和非晶陶瓷SiOC之间的变形不相容性。
Ni-SiOC nanocomposites are synthesized through co-sputtering Ni and Si-O-C and then annealed at high temperature up to 800 °C to obtain two characteristic microstructures, core (crystalline Ni)-shell (amorphous ceramic SiOC) nanostructures and submicron-grained Ni containing amorphous ceramic SiOC particles.In-situscanning electron microscope (SEM) compression tests show that both types of Ni-SiOC nanocomposites exhibit high strength and good plastic flow stability due to microstructure-promoted plastic co-deformation between amorphous ceramics and Ni grains. However,in-situtension tests reveal that the core-shell nanostructures exhibit brittle fracture behaviour at a low strength due to cracking along amorphous cores, while the submicron-grained Ni can reach the similar strength to that of compression but a limited plasticity due to interface decohesion facilitated by deformation incompatibility between Ni and amorphous ceramic SiOC.