Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Low friction in bcc metals via grain boundary sliding

Journal Article · · Physical Review Materials

In this work, low friction is demonstrated with pure polycrystalline tantalum sliding contacts in both molecular dynamics simulations and ultrahigh vacuum experiments. This phenomenon is shown to be correlated with deformation occurring primarily through grain boundary sliding and can be explained using a recently developed predictive model for the shear strength of metals. Specifically, low friction is associated with grain sizes at the interface being smaller than a critical, material-dependent value, where a crossover from dislocation mediated plasticity to grain-boundary sliding occurs. Low friction is therefore associated with inverse Hall-Petch behavior and softening of the interface. Direct quantitative comparisons between experiments and atomistic calculations are used to illustrate the accuracy of the predictions.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1639071
Report Number(s):
SAND--2020-6448J; 686887
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 4; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (54)

Poiseuille and Couette flow of non-Newtonian fluids journal January 1959
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Grain-boundary sliding and its accommodation during creep and superplasticity journal August 1976
On grain boundary sliding and diffusional creep journal April 1971
Density of Liquid Tantalum and Estimation of Critical Point Data journal September 2018
Grain boundary sliding revisited: Developments in sliding over four decades journal February 2006
Evolution of microstructures and phases of Al–Mg alloy under 4 GPa high pressure journal May 2007
Stabilization of nanocrystalline grain sizes by solute additions journal December 2008
Linking microstructural evolution and macro-scale friction behavior in metals journal November 2016
Optical In Situ Micro Tribometer for Analysis of Real Contact Area for Contact Mechanics, Adhesion, and Sliding Experiments journal October 2011
Characterization of Strain-Rate Sensitivity and Grain Boundary Structure in Nanocrystalline Gold-Copper Alloys journal September 2009
A micro-indentation study of superplasticity in Pb, Sn, and Sn-38 wt% Pb journal August 1988
On the validity of the hall-petch relationship in nanocrystalline materials journal October 1989
Superplasticity—Recent advances and future directions journal January 1989
A unified approach to grain boundary sliding in creep and superplasticity journal July 1994
Grain-size dependent hardening and softening of nanocrystalline Cu and Pd journal June 1992
Why anomalous slip in body-centred cubic metals? journal December 2001
Nano-sized twins induce high rate sensitivity of flow stress in pure copper journal April 2005
Mechanistic models for the activation volume and rate sensitivity in metals with nanocrystalline grains and nano-scale twins journal July 2005
Coupling grain boundary motion to shear deformation journal November 2006
Toward a quantitative understanding of mechanical behavior of nanocrystalline metals journal July 2007
Development of physically based atomistic microstructures: The effect on the mechanical response of polycrystals journal February 2017
Thermally-activated non-Schmid glide of screw dislocations in W using atomistically-informed kinetic Monte Carlo simulations journal February 2015
A physically based model of temperature and strain rate dependent yield in BCC metals: Implementation into crystal plasticity journal January 2015
Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: fcc versus bcc metals journal September 2004
Inverse Hall–Petch relationship in nanocrystalline tantalum journal September 2013
Developing anisotropic yield models of polycrystalline tantalum using crystal plasticity finite element simulations journal July 2018
Mechanical properties of nanocrystalline materials journal May 2006
Hardness and strain rate sensitivity of nanocrystalline Cu journal June 2006
Friction transitions in nanocrystalline nickel journal April 2011
Stress-dependent grain size evolution of nanocrystalline Ni-W and its impact on friction behavior journal October 2016
Shear-induced softening of nanocrystalline metal interfaces at cryogenic temperatures journal January 2018
Structure and mechanical properties of tribologically induced nanolayers journal February 2006
Microstructure of tribologically induced nanolayers produced at ultra-low wear rates journal September 2007
Friction of Clean Metals and the Influence of Surface Films journal December 1938
Mechanism of Metallic Friction journal August 1942
Friction of Metals in Reciprocating Sliding journal August 1961
Viscosity, Plasticity, and Diffusion as Examples of Absolute Reaction Rates journal April 1936
Six decades of the Hall–Petch effect – a survey of grain-size strengthening studies on pure metals journal June 2016
Kinetics of flow stress in crystals with high intrinsic lattice friction journal August 2007
Grain boundary sliding as a deformation mechanism during creep journal October 1970
Grain-boundary sliding and diffusion creep in polycrystalline solids journal February 1971
Grain Size Effect on Deformation Mechanisms of Nanocrystalline bcc Metals journal November 2012
Experimental and modelling investigations on strain rate sensitivity of an electrodeposited 20 nm grain sized Ni journal November 2007
Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool journal December 2009
Physically-based strength model of tantalum incorporating effects of temperature, strain rate and pressure journal June 2016
Paleo-tribology: development of wear measurement techniques and a three-dimensional model revealing how grinding dentitions self-wear to enable functionality journal January 2016
Effects of High Shearing Stress Combined with High Hydrostatic Pressure journal November 1935
Shock-induced plasticity in tantalum single crystals: Interatomic potentials and large-scale molecular-dynamics simulations journal October 2013
Ultimate Strength of Metals journal March 2020
Design of Stable Nanocrystalline Alloys journal August 2012
Slip planes in bcc transition metals journal June 2013
Superplasticity in the Aluminium–Zinc Eutectoid journal January 1969
Grain boundary relaxation strengthening of nanocrystalline Ni–W alloys journal March 2012

Similar Records

Competing Grain Boundary and Interior Deformation Mechanisms with Varying Sizes
Book · Sun Dec 31 23:00:00 EST 2017 · OSTI ID:1432151

Reversing inverse Hall-Petch and direct computation of Hall-Petch coefficients
Journal Article · Thu Dec 21 23:00:00 EST 2023 · Acta Materialia · OSTI ID:2342118