The Compositional Variation of Microindentation Induced Densified and Plastic Deformation Volumes in Simple Silicate Glasses

Bidragets oversatte titel: Kompositions Afhængigheden af Mikroindentations Inducered Densificerede og Plastisk Deformerede Volumener i Simple Silikat Glas

Christian Hermansen, Jun Matsuoka, Satoshi Yoshida, Hiroki Yamazaki, Yoshinari Kato, Yuanzheng Yue

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Abstract

The densification and plastic deformation occurringin glass subjected to microindentation are establishedas two independent deformation mechanisms, and thought to be intimately linked to the concept of hardness and crack resistance (i.e., the load at which radial cracks nucleate at half the corners of a Vickers pyramid indent.).These two properties arecommercially important as they determine e.g. scratchability and the ultimate strength of glass, yet little is known of their variation with glass composition.In the presentwork, wedeterminethe densified and plastically deformed volumes under microindentation in simple silicate glasses by AFM imaging the indent before and after annealing around the glass transition temperatureat whichthe densified volumecan rapidly relaxes. The results show that the densified volume is proportional to thecompressibility, but inversely tothe bulk modulus, lending credence to the empirical correlation between hardness and elastic moduli. The plastic deformation volumecould not be measurable up to a modifying ion fraction of 20%, butwas found to increase linearly withthisfraction above 20%. As plastic flow volume is thought to be cause of radial cracking, this finding is an important guide for discovering new highlycrack resistant silicate glasses.
Bidragets oversatte titelKompositions Afhængigheden af Mikroindentations Inducered Densificerede og Plastisk Deformerede Volumener i Simple Silikat Glas
OriginalsprogEngelsk
TitelThirteenth International Conference on the Physics of Non-Crystalline Solids
Antal sider1
Publikationsdato17 sep. 2012
Sider42
StatusUdgivet - 17 sep. 2012
BegivenhedThirteenth International Conference on the Physics of Non-Crystalline Solids - Yichang, Kina
Varighed: 16 sep. 201220 sep. 2012
Konferencens nummer: 13

Konference

KonferenceThirteenth International Conference on the Physics of Non-Crystalline Solids
Nummer13
Land/OmrådeKina
ByYichang
Periode16/09/201220/09/2012

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