Modeling the dependence of strength on grain sizes in nanocrystalline materials

Autor:	Wei He, Sanjeev D Bhole and DaoLun Chen
Jazyk:	angličtina
Rok vydání:	2008
Předmět:	nanocrystalline materials grain size hardness strength modeling Hall–Petch relationship grain boundary affected zone Materials of engineering and construction. Mechanics of materials TA401-492 Biotechnology TP248.13-248.65
Zdroj:	Science and Technology of Advanced Materials, Vol 9, Iss 1, p 015003 (2008)
Druh dokumentu:	article
ISSN:	1468-6996 1878-5514
Popis:	A model was developed to describe the grain size dependence of hardness (or strength) in nanocrystalline materials by combining the Hall–Petch relationship for larger grains with a coherent polycrystal model for nanoscale grains and introducing a log-normal distribution of grain sizes. The transition from the Hall–Petch relationship to the coherent polycrystal mechanism was shown to be a gradual process. The hardness in the nanoscale regime was observed to increase with decreasing grain boundary affected zone (or effective grain boundary thickness, Δ) in the form of Δ−1/2. The critical grain size increased linearly with increasing Δ. The variation of the calculated hardness value with the grain size was observed to be in agreement with the experimental data reported in the literature.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/42ad4d36dc2c4cc2ba3096f9a7e9a1c4 Zobrazit plný text záznamu View record in DOAJ