The dislocation density-based model after Kocks–Mecking–Estrin (KME) is widely used to characterize the thermally activated plastic deformation and dislocation kinetics. According to the model, the slope of the stress–strain curve decreases linearly with stress, which contradicts the experimental observation. In the current study, the evolution of dislocation density in the model is generalized to account for the nonlinearity of the slope. © 2018, The Minerals, Metals &amp; Materials Society and ASM International.

K Hariharan

Department of Mechanical Engineering

Krishnaswamy Hariharan

Frederic Barlat

Condensed Matter Physics

MATERIALS SCIENCE

Metallurgical engineering

Dislocation densities

NONLINEAR STRAIN HARDENING

STRAIN CURVES

THERMALLY ACTIVATED

Strain hardening

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

In a recent paper, Mishra et al.&nbsp;[Effect of obstacle strength and spacing on the slope of Haasen plot. Mater Sci Technol. 2019;1–6. doi:10.1080/02670836.2019.1567043], discrepancy between theoretical and experimental results in the slope of the Haasen plot between pure metals and alloys were reported. The discrepancy arises from a common belief that when Haasen plot for pure metals is extended to metals with multiple strengthening mechanisms, the inverse of activation volume components can be linearly superposed. It is conjectured that the slope of the Haasen plot should remain the same for both the pure metals and alloys, as it is governed only by dislocation–dislocation interaction. The purpose of this note is to clarify that the conjecture of invariant Haasen slope is only a special case. © 2019, © 2019 Institute of Materials, Minerals and Mining.

Materials Science and Technology (United Kingdom)

Comments on ‘Effect of obstacle strength and spacing on the slope of Haasen plot’

Modified Kocks–Mecking–Estrin Model to Account Nonlinear Strain Hardening

Journal	Data powered by TypesetMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Publisher	Data powered by TypesetSpringer Boston
ISSN	10735623
Open Access	No