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 titel | Kompositions Afhængigheden af Mikroindentations Inducered Densificerede og Plastisk Deformerede Volumener i Simple Silikat Glas |
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Originalsprog | Engelsk |
Titel | Thirteenth International Conference on the Physics of Non-Crystalline Solids |
Antal sider | 1 |
Publikationsdato | 17 sep. 2012 |
Sider | 42 |
Status | Udgivet - 17 sep. 2012 |
Begivenhed | Thirteenth International Conference on the Physics of Non-Crystalline Solids - Yichang, Kina Varighed: 16 sep. 2012 → 20 sep. 2012 Konferencens nummer: 13 |
Konference
Konference | Thirteenth International Conference on the Physics of Non-Crystalline Solids |
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Nummer | 13 |
Land/Område | Kina |
By | Yichang |
Periode | 16/09/2012 → 20/09/2012 |