Tensile ductility and necking in consolidated amorphous alumina
Tensile ductility and necking in consolidated amorphous alumina
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DOI：
10.1111/jace.18127
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发表时间：
2021-09
影响因子：
3.9
通讯作者：
Yanming Zhang;Haidong Liu;Siddharth Sundararaman;Liping Huang;Yunfeng Shi
中科院分区：
文献类型：
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作者：
Yanming Zhang;Haidong Liu;Siddharth Sundararaman;Liping Huang;Yunfeng Shi
氧化物玻璃是现代世界最具变革性的材料之一，由于其脆性，在负载下很容易破裂。使用经典的分子动力学模拟，我们通过在室温下固结玻璃纳米粒子来制备非晶态氧化铝。我们表明，固结的非晶氧化铝具有加工硬化能力，因此变形均匀，并在张力下通过颈缩断裂，而通过传统熔融淬火工艺获得的非晶氧化铝由于严重的剪切带而发生灾难性断裂。这一发现表明，如果加工得当，非晶氧化物可以像延展性金属一样变形和断裂，这将显着地将氧化物玻璃的应用扩展到需要承载或机械可靠性的新领域。
Oxide glass, one of the most transformative materials in the modern world, breaks easily under load due to its brittleness. Using classical molecular dynamics simulations, we prepared amorphous alumina by consolidating glass nanoparticles at room temperature. We showed that consolidated amorphous alumina exhibits work hardening ability, hence deforms homogeneously and fractures via necking under tension, while amorphous alumina obtained from the traditional melt‐quench process fractures catastrophically due to severe shear banding. This finding suggests that if processed properly, amorphous oxides could deform and fracture like ductile metals, which will significantly expand the applications of oxide glasses into new areas where load bearing or mechanical reliability is necessary.