在室温无形氧化中的特殊微尺度可塑性
Erkka J Frankberg1,2, Aloshious Lambai1, Jiahui Zhang1,3
1Materials Science and Environmental Engineering Unit, Tampere University, Korkeakoulunkatu 6, Tampere, 33720, Finland.
Advanced materials (Deerfield Beach, Fla.)
|July 29, 2023
概括
无形氧化 (a-Al2O3) 呈现出显著的室温可塑性,延伸到微尺度和高张变率. 这一发现为开发强大,耐损坏的工程材料提供了新的可能性.
科学领域:
- 材料科学 材料科学 材料科学
- 固体力学 固体力学是什么
- 纳米技术纳米技术
背景情况:
- 氧化玻璃被广泛使用,但由于脆性而受到限制.
- 无形氧化 (a-Al2O3) 是一个罕见的例外,在室温下显示纳米级可塑性.
研究的目的:
- 为了研究a-Al2O3的室温可塑性,在微尺度和高张变率下.
- 了解底层的变形机制.
- 评估散装应用的潜力.
主要方法:
- 在现场进行微柱状压缩实验.
- 大规模的分子动力学模拟.
主要成果:
- a-Al2O3微支柱变形到50%的压力没有断裂.
- 塑性机制包括粘性爬行和剪切带滑动.
- 实验性应变率达到了1000s-1,这对于冲击负荷来说是典型的.
- 观察到的可塑性体积扩大了5个数量级.
结论:
- a-Al2O3的室温可塑性延伸到微尺度和高拉伸率.
- 变形通过粘性爬行和剪切带发生.
- 无形氧化物显示出作为轻质,高强度,耐损坏的工程材料的潜力.
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