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Title: High‐Strength Nanotwinned Al Alloys with 9R Phase

Journal Article · · Advanced Materials
ORCiD logo [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6];  [1];  [1];  [1];  [4];  [1];  [1]
  1. School of Materials Engineering Purdue University West Lafayette IN 47907 USA
  2. Mechanical and Materials Engineering University of Nebraska‐Lincoln Lincoln NE 68588 USA
  3. Mechanical and Industrial Engineering Louisiana State University Baton Rouge LA 70803 USA
  4. Division of Engineering and Applied Science California Institute of Technology Pasadena CA 91125 USA
  5. Oak Ridge National Laboratory Oak Ridge TN 37830 USA
  6. State Key Lab of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

Abstract Light‐weight aluminum (Al) alloys have widespread applications. However, most Al alloys have inherently low mechanical strength. Nanotwins can induce high strength and ductility in metallic materials. Yet, introducing high‐density growth twins into Al remains difficult due to its ultrahigh stacking‐fault energy. In this study, it is shown that incorporating merely several atomic percent of Fe solutes into Al enables the formation of nanotwinned (nt) columnar grains with high‐density 9R phase in Al(Fe) solid solutions. The nt Al–Fe alloy coatings reach a maximum hardness of ≈5.5 GPa, one of the strongest binary Al alloys ever created. In situ uniaxial compressions show that the nt Al–Fe alloys populated with 9R phase have flow stress exceeding 1.5 GPa, comparable to high‐strength steels. Molecular dynamics simulations reveal that high strength and hardening ability of Al–Fe alloys arise mainly from the high‐density 9R phase and nanoscale grain sizes.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0016337
OSTI ID:
1417710
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 11 Vol. 30; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

References (52)

Influence of Twin Thickness and Grain Size on the Tensile Behavior of Fully Nanotwinned CuAl Alloys : Influence of Twin Thickness and Grain Size journal December 2015
Experimental Evidence for Grain-Boundary Sliding in Ultrafine-Grained Aluminum Processed by Severe Plastic Deformation journal January 2006
Ultrahigh Strain Hardening in Thin Palladium Films with Nanoscale Twins journal April 2011
Tailoring Nanostructured, Graded, and Particle-Reinforced Al Laminates by Accumulative Roll Bonding journal April 2011
High-Strength and High-Ductility Nanostructured and Amorphous Metallic Materials journal June 2014
Substitutional solution hardening journal March 1963
Ultrahigh tensile strength of amorphous Al-Ni-(Nd,Gd)-Fe alloys containing nanocrystalline Al particles journal October 1995
Analysis of grain boundary networks and their evolution during grain boundary engineering journal February 2003
Influence of Grain Boundary Structure on Dislocation Nucleation in FCC Metals book April 2008
Enhanced hardening in Cu/330 stainless steel multilayers by nanoscale twinning journal February 2004
Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients journal April 2005
The Hall–Petch breakdown in nanocrystalline metals: A crossover to glass-like deformation journal October 2007
Interactions between non-screw lattice dislocations and coherent twin boundaries in face-centered cubic metals journal March 2008
Structure and motion of junctions between coherent and incoherent twin boundaries in copper journal September 2009
Detwinning mechanisms for growth twins in face-centered cubic metals journal April 2010
High strength, epitaxial nanotwinned Ag films journal January 2011
Enhanced solid solution effects on the strength of nanocrystalline alloys journal February 2011
Twinning dislocation multiplication at a coherent twin boundary journal September 2011
Solute strengthening from first principles and application to aluminum alloys journal May 2012
Plastic flow stability of nanotwinned Cu foils journal June 2010
Plasticity in small-sized metallic systems: Intrinsic versus extrinsic size effect journal August 2011
Growth of Y-Shaped Nanorods through Physical Vapor Deposition journal December 2005
Hybrid nanostructured aluminum alloy with super-high strength journal December 2015
Dual-phase nanostructuring as a route to high-strength magnesium alloys journal April 2017
Nanostructural hierarchy increases the strength of aluminium alloys journal September 2010
In situ nanoindentation study on plasticity and work hardening in aluminium with incoherent twin boundaries journal September 2014
A new view of the onset of plasticity during the nanoindentation of aluminium journal August 2006
Quantitative prediction of solute strengthening in aluminium alloys journal August 2010
Defective twin boundaries in nanotwinned metals journal May 2013
It's all about imperfections journal July 2013
Dislocation processes in the deformation of nanocrystalline aluminium by molecular-dynamics simulation journal September 2002
High-velocity projectile impact induced 9R phase in ultrafine-grained aluminium journal November 2017
Epitaxial nanotwinned Cu films with high strength and high conductivity journal August 2008
Dislocation structures of Σ3 {112} twin boundaries in face centered cubic metals journal July 2009
Plasticity and ultra-low stress induced twin boundary migration in nanotwinned Cu by in situ nanoindentation studies journal June 2014
The influence of grain boundary inclination on the structure and energy of σ = 3 grain boundaries in copper journal December 1992
Structures and energies of Σ 3 asymmetric tilt grain boundaries in copper and aluminium journal August 2007
Asymmetric tilt grain boundary structure and energy in copper and aluminium journal September 2007
Structure and stability of Σ3 grain boundaries in face centered cubic metals journal February 2013
Formation Mechanisms of High-density Growth Twins in Aluminum with High Stacking-Fault Energy journal February 2013
Repulsive force between screw dislocation and coherent twin boundary in aluminum and copper journal June 2007
Reversible Twinning in Pure Aluminum journal May 2009
High Resolution Transmission Electron Microscope Observation of Zero-Strain Deformation Twinning Mechanisms in Ag journal April 2011
Theoretical prediction and direct observation of the 9 R structure in Ag journal July 1992
Nanotwinned metal MEMS films with unprecedented strength and stability journal June 2017
Deformation Twinning in Nanocrystalline Aluminum journal April 2003
A Maximum in the Strength of Nanocrystalline Copper journal September 2003
Ultrahigh Strength and High Electrical Conductivity in Copper journal April 2004
Grain Boundary-Mediated Plasticity in Nanocrystalline Nickel journal July 2004
Observation of Atomic Diffusion at Twin-Modified Grain Boundaries in Copper journal August 2008
Grain boundary stability governs hardening and softening in extremely fine nanograined metals journal March 2017
Twinning effects on strength and plasticity of metallic materials journal April 2016

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