We explore the links between strain localisation and microstructural evolution in ice Ih deformed by dislocation creep. Using digital image correlation (DIC), we monitored of field two coarse-grained columnar samples creep (uniaxial compression at constant load) −7 °C 0.5 MPa up to 9.5% bulk shortening. After a brief transient (<0.2% strain), which localises nearby grain boundaries, viscoplasti...

Seismic anisotropy produced by aligned olivine in oceanic lithosphere offers a window into mid-ocean ridge (MOR) dynamics. Yet, interpreting the context of grain-scale deformation processes and strain observed laboratory experiments natural samples has proven challenging due to incomplete seismological constraints length scale differences spanning orders magnitude. To bridge this observational ...

Creep damage is one of the serious problems for the high temperature industries and computational approach (such as continuum damage mechanics) has been developed and used, complementary to the experimental approach, to assist safe operation. However, there are no ready creep damage constitutive equations to be used for predicting the lifetime for this type of alloy, particularly for low stress...

Laser powder bed fusion (LPBF) was used to consolidate powders of a Ni-Cr-Fe-Mo alloy (Hastelloy X) blended with 1 wt% Y2O3 nanometric powders. The nearly-dense, crack-free specimens, and without oxide dispersion strengthening (ODS), exhibit high-aspect ratio grains, aligned in the build direction strong texture: 〈001〉 is along both laser scanning direction. Creep tests performed at 950 °C, com...

It is devoted to the experimental study of creep an aluminum alloy containing microscopic inclusions. was found that preliminary electric ignition (j&amp;lt;3· 10 6 A/m 2 ) material leads increase in samples. The reasons for observed changes are associated by authors with formation local areas high mechanical stresses near interface inclusion --- matrix interface. assessment level emerging ther...

The γ/γ' interface dislocation network is reported to improve the high temperature creep resistance of single crystal superalloys and is usually found to deposit in {001} interface. In this work, a new type of dislocation network was found in {111} γ/γ' interface at a single crystal model superalloy crept at 1100 °C/100 MPa. The dislocations in the network are screw with Burgers vectors of 1/2 ...

--A state variable approach based on Hart’s [1] formulation for describing nonelastic deformation of crystalline solids is reviewed. It is shown to describe commonly observed deformation phenomena, such as creep. Presently, deformation phenomena such as inhomogeneous flow and those involving strong dislocation-solute interactions are not within the scope of this approach. Revue Phys. Appl. 23 (...

The 3rd generation Al–Li alloy is a good candidate for large panel fabrication adopting creep age forming (CAF) because of its balanced synergy high strength, toughness, corrosion resistance and light weight. In this study, the creep-ageing behaviour 2xxx series in T8 state has been experimentally investigated under different stresses ranging from 300 to 430 MPa at 143 °C up 20 h. corresponding...

Constitutive Modeling of Creep of Single Crystal Superalloys. (August 2005) Sharat Chand Prasad, B.Tech., Indian Institute of Technology, Kanpur; M.S., Texas A&M University Chair of Advisory Committee: Dr. K. R. Rajagopal In this work, a constitutive theory is developed, within the context of continuum mechanics, to describe the creep deformation of single crystal superalloys. The constitutive ...