Insights into dynamic strain aging under cyclic creep with reference to strain burst: Some new observations and mechanisms. Part-1: Mechanistic aspects

The dependence of creep deformation behavior of nickel bicrystal specimens on grain boundary (GB) complexion was investigated by performing a simulated bending creep test using molecular dynamics methods. Strain burst phenomena were observed during the low temperature [500 K, i.e., <0.3 * melting point of nickel (T)] bending creep process. Atomic strain and dislocation analyses showed that the time of occurrence of strain burst depends on how easily GB migration happens in bicrystal specimens. Specimens with kite monolayer segregation GB complexion were found to be stable at low temperature (500 K), whereas specimens with split-kite GB complexion were stable at a comparatively higher temperature (900 K). In case of further elevated creep temperatures, e.g., 1100 K and 1300 K, split-kite GB complexion becomes unstable and leads to early failure of the specimen at those temperatures. Additionally, it was observed that split-kite bilayer segregation and normal kite GB complexions exhibit localized increases in elastic modulus during bending creep process, occurring at temperatures of 1100 K and 1300 K, respectively, due to the formation of interpenetrating icosahedral clusters. Graphical abstract Representative creep curves during bending creep deformation of various grain boundary complexions at 900 K.

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Effect of grain boundary complexions on the deformation behavior of Ni bicrystal during bending creep

Reddy

Pal

2018

J Mol Model

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Effect of Mean Stress on Ratcheting Fatigue Behavior of Modified 9 Cr–1 Mo Steel at RT and 600 °C

Mishra

Srinivas

Sastry

et al. 2022

Trans Indian Natl. Acad. Eng.

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Effect of Pre-ratcheting on Tensile Properties of Micro-alloyed 2.25Cr–Mo Steel at Ambient Temperature

Rajpurohit

Sahu

2022

Trans Indian Natl. Acad. Eng.

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Insights into dynamic strain aging under cyclic creep with reference to strain burst: Some new observations and mechanisms. Part-1: Mechanistic aspects

Cited by 12 publications

References 38 publications

Effect of grain boundary complexions on the deformation behavior of Ni bicrystal during bending creep

Effect of grain boundary complexions on the deformation behavior of Ni bicrystal during bending creep

Effect of Mean Stress on Ratcheting Fatigue Behavior of Modified 9 Cr–1 Mo Steel at RT and 600 °C

Effect of Pre-ratcheting on Tensile Properties of Micro-alloyed 2.25Cr–Mo Steel at Ambient Temperature

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