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镧铈基金属玻璃中高温变形与β弛豫之间的相关性

Correlation between High Temperature Deformation and β Relaxation in LaCeBased Metallic Glass.

作者信息

Chen Yinghong, Qiao Jichao

机构信息

School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, China.

出版信息

Materials (Basel). 2020 Feb 12;13(4):833. doi: 10.3390/ma13040833.

DOI:10.3390/ma13040833
PMID:32059531
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7079608/
Abstract

Hightemperature deformation around the glass transition temperature T and the dynamic mechanical behavior of LaCeAlCo metallic glass were investigated. According to dynamic mechanical analysis (DMA) results, LaCeAlCo metallic glass exhibits a pronounced slow β relaxation process. In parallel, strainrate jump experiments around the glass transition temperature were performed in a wide range of strain rate ranges. The apparent viscosity shows a strong dependence on temperature and strain rate, which reflects the transition from nonNewtonian to Newtonian flow. At low strain or high temperature, a transition was observed from a nonNewtonian viscous flow to Newtonian viscous flow. It was found that the activation volume during plastic deformation of LaCeAlCo metallic glass is higher than that of other metallic glasses. Higher values of activation volume in LaCeAlCo metallic glass may be attributed to existence of a pronounced slow β relaxation. It is reasonable to conclude that slow β relaxation in LaCeAlCo metallic glass corresponds to the "soft" regions (structural heterogeneities) in metallic glass.

摘要

研究了LaCeAlCo金属玻璃在玻璃化转变温度T附近的高温变形及动态力学行为。根据动态力学分析（DMA）结果，LaCeAlCo金属玻璃呈现出明显的缓慢β弛豫过程。同时，在较宽的应变速率范围内进行了玻璃化转变温度附近的应变速率跳跃实验。表观粘度表现出强烈的温度和应变速率依赖性，这反映了从非牛顿流动到牛顿流动的转变。在低应变或高温下，观察到从非牛顿粘性流动到牛顿粘性流动的转变。发现LaCeAlCo金属玻璃塑性变形过程中的激活体积高于其他金属玻璃。LaCeAlCo金属玻璃中较高的激活体积值可能归因于明显的缓慢β弛豫的存在。可以合理地得出结论，LaCeAlCo金属玻璃中的缓慢β弛豫对应于金属玻璃中的“软”区域（结构不均匀性）。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/95a23302b22b/materials-13-00833-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/6194dc4bbc24/materials-13-00833-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/478065b04a3c/materials-13-00833-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/0a44ee356cec/materials-13-00833-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/fcfec9247cd8/materials-13-00833-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/b26e3e639944/materials-13-00833-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/345362412777/materials-13-00833-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/23a7fb6a8178/materials-13-00833-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/4578deb5fd8b/materials-13-00833-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/0c48f0ef16d8/materials-13-00833-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/95a23302b22b/materials-13-00833-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/6194dc4bbc24/materials-13-00833-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/478065b04a3c/materials-13-00833-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/0a44ee356cec/materials-13-00833-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/fcfec9247cd8/materials-13-00833-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/b26e3e639944/materials-13-00833-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/345362412777/materials-13-00833-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/23a7fb6a8178/materials-13-00833-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/4578deb5fd8b/materials-13-00833-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/0c48f0ef16d8/materials-13-00833-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/556e/7079608/95a23302b22b/materials-13-00833-g010.jpg

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本文引用的文献

1
Evolution of hidden localized flow during glass-to-liquid transition in metallic glass.金属玻璃中玻璃-液体转变期间隐藏局域流的演化。
Nat Commun. 2014 Dec 15;5:5823. doi: 10.1038/ncomms6823.
2
Relaxation of bulk metallic glasses studied by mechanical spectroscopy.通过力学光谱研究块状金属玻璃的弛豫。
J Phys Chem B. 2013 Oct 31;117(43):13658-66. doi: 10.1021/jp4067179. Epub 2013 Oct 10.
3
Correlation between β relaxation and self-diffusion of the smallest constituting atoms in metallic glasses.金属玻璃中最小组成原子的β弛豫与自扩散的相关性。
Phys Rev Lett. 2012 Aug 31;109(9):095508. doi: 10.1103/PhysRevLett.109.095508.
4
Tensile plasticity in metallic glasses with pronounced β relaxations.具有明显β弛豫的金属玻璃的拉伸塑性。
Phys Rev Lett. 2012 Jan 6;108(1):015504. doi: 10.1103/PhysRevLett.108.015504. Epub 2012 Jan 4.