Details

Autor(en) / Beteiligte

• Maharjan, S.
• Zhang, X. C.
• Xuan, F. Z.
• Wang, Z. D.
• Tu, S. T.

Titel

Residual stresses within oxide layers due to lateral growth strain and creep strain: Analytical modeling

Ist Teil von

• Journal of applied physics, 2011-09, Vol.110 (6), p.063511-063511-8

Ort / Verlag

American Institute of Physics

Erscheinungsjahr

2011

Link zum Volltext

Quelle

American Institute of Physics

Beschreibungen/Notizen

• Deflection test has been widely used to estimate residual stresses within an oxide layer during isothermal oxidation of one surface of an alloy or metal. Deflection models so far developed have considered elastic, plastic, and creep model to predict stresses produced from curvature of the metal/oxide interface. However, none of the models have considered growth stress. During oxidation, when new oxide forms along grain boundaries lying perpendicular to the interface, it will generate a lateral growth strain. When this strain is constrained by the underlying metal, it will generate growth stress in the oxide. This lateral growth strain combined with creep strain of the both oxide and metal will then provide the realistic approach to deal with stresses in oxide/metal composite. Considering these situations an analytical model has been developed to determine residual stresses for the metal/oxide composite of the deflection test. The stress value in both metal and oxide is calculated for notional mechanical properties. Moreover, the effects of oxide thickness, oxidation time, lateral growth constant, and the creep constants on stresses are discussed.