Publications by Ali Tehranchi | EPFL Graph Search

Mechanism and Prediction of Hydrogen Embrittlement in fcc Stainless Steels and High Entropy Alloys

William Curtin, Xiao Zhou, Ali Tehranchi

The urgent need for clean energy coupled with the exceptional promise of hydrogen (H) as a clean fuel is driving development of new metals resistant to hydrogen embrittlement. Experiments on new fcc high entropy alloys present a paradox: these alloys absor ...

AMER PHYSICAL SOC2021

A decohesion pathway for hydrogen embrittlement in nickel: Mechanism and quantitative prediction

William Curtin, Xiaoqing Zhou, Ali Tehranchi

Hydrogen embrittlement (HE) is a ubiquitous and catastrophic mode of fracture in metals. Here, embrittlement is considered as an intrinsic ductile-brittle transition at the crack tip, where H at the crack tip can reduce the stress intensity K-Ic for cleava ...

PERGAMON-ELSEVIER SCIENCE LTD2020

The role of atomistic simulations in probing hydrogen effects on plasticity and embrittlement in metals

William Curtin, Ali Tehranchi

Atomistic simulations are a powerful complement to experimental probes for understanding the nanoscale processes associated with the effects of hydrogen (H) on plasticity and fracture that are the underlying causes of hydrogen embrittlement (HE). Current e ...

PERGAMON-ELSEVIER SCIENCE LTD2019

Solute strengthening of basal slip in Mg alloys

William Curtin, Binglun Yin, Ali Tehranchi

2018

Softening and hardening of yield stress by hydrogen–solute interactions

William Curtin, Binglun Yin, Ali Tehranchi

Hydrogen atoms have a wide variety of effects on the mechanical performance of metals, and the underlying mechanisms associated with effects on plastic flow and embrittlement remain to be discovered or validated. Here, the reduction in the plastic flow str ...

Taylor & Francis2017

Atomistic mechanisms of hydrogen embrittlement

Ali Tehranchi

The detrimental effects of the H on the mechanical properties of the metals are known for more than a century. One of the most important degradation mechanisms is H embrittlement (HE). In this thesis, we examined a few famous proposed mechanisms in the fie ...

EPFL2017

Atomistic study of hydrogen embrittlement of grain boundaries in nickel: II. Decohesion

William Curtin, Ali Tehranchi

Atomistic simulations of bicrystal samples containing a grain boundary are used to examine the effect of hydrogen atoms on the nucleation of intergranular cracks in Ni. Specifically, the theoretical strength is obtained by rigid separation of the two cryst ...

Institute of Physics2017

Atomistic study of hydrogen embrittlement of grain boundaries in nickel: I. Fracture

William Curtin, Ali Tehranchi

Hydrogen ingress into a metal is a persistent source of embrittlement. Fracture surfaces are often intergranular, suggesting favorable cleave crack growth along grain boundaries (GBs) as one driver for embrittlement. Here, atomistic simulations are used to ...

Elsevier2017

Hydrogen–vacancy–dislocation interactions in α-Fe

William Curtin, Ali Tehranchi, Xi Zhang

Atomistic simulations of the interactions between dislocations, hydrogen atoms, and vacancies are studied to assess the viability of a recently proposed mechanism for the formation of nanoscale voids in Fe-based steels in the presence of hydrogen. Quantum- ...

Institute of Physics2016