Temperature dependency of mechanical behavior and strain rate sensitivity of an Al–Mg alloy with bimodal grain size

Magee, Andrew C.; Ladani, Leila

doi:10.1016/j.msea.2013.06.016

Cited by 17 publications

(7 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar enhancements are also observed in SPD-processed Al-Mg alloys [8][9][10][11][12][13][14][15][16][17][18][19][20] which exhibit additional strengthening and grain refinement due to the presence of Mg solutes. However, Al-Mg alloys have unstable grain structures at high temperatures after SPD processing and any benefits in the mechanical properties attained by grain refinement are lost through early recrystallization [7,[21][22][23][24].…”

Section: Introductionsupporting

confidence: 64%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

show abstract

Section: Introductionsupporting

confidence: 64%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

View full text Add to dashboard Cite

show abstract

“…As grain size is decreased or varied for the Al-Mg alloy, susceptibility of SCC has been found to increase [16] and decrease [1,2], with variables such as type of applied stress, exposure environment and composition of the alloy having an effect on the outcome. Researchers have found that varying strain rate has an effect on the mechanical properties of Al-5083, particularly the magnitude of the percent elongation as well as the ultimate and failure stresses [19][20][21]. The ultimate tensile stress of conventional Al-Mg alloys have been reported to be between 450 and 500 MPa while cryomilled UFG Al-Mg alloys sustain stresses upwards of 700-750 MPa [8,20].…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have found that varying strain rate has an effect on the mechanical properties of Al-5083, particularly the magnitude of the percent elongation as well as the ultimate and failure stresses [19][20][21]. The ultimate tensile stress of conventional Al-Mg alloys have been reported to be between 450 and 500 MPa while cryomilled UFG Al-Mg alloys sustain stresses upwards of 700-750 MPa [8,20]. Negative and positive strain rate sensitivity in air has been reported for NC and UFG alloys [20,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…The ultimate tensile stress of conventional Al-Mg alloys have been reported to be between 450 and 500 MPa while cryomilled UFG Al-Mg alloys sustain stresses upwards of 700-750 MPa [8,20]. Negative and positive strain rate sensitivity in air has been reported for NC and UFG alloys [20,[22][23][24][25]. The sensitivity to strain rate at exceedingly low strain rates has yet to be investigated in a corrosive environment and compared across conventional and UFG Al-Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Slow strain rate testing and stress corrosion cracking of ultra-fine grained and conventional Al–Mg alloy

Sharma

Tomedi

Weigley

2014

Materials Science and Engineering: A

View full text Add to dashboard Cite

Stress corrosion cracking susceptibility was investigated for an ultra-fine grained (UFG) Al-7.5Mg alloy and a conventional 5083 H111 alloy in natural seawater using slow strain rate testing (SSRT) at very slow strain rates between 1E À 5 s À 1 , 1E À 6 s À 1 and 1E À 7 s À 1. The UFG Al-7.5Mg alloy was produced by cryomilling, while the 5083 H111 alloy is considered as a wrought manufactured product. The response of tensile properties to strain rate was analyzed and compared. Negative strain rate sensitivity was observed for both materials in terms of the elongation to failure. However, the UFG alloy displayed strain rate sensitivity in relation to strength while the conventional alloy was relatively strain rate insensitive. The mechanical behavior of the conventional 5083 alloy was attributed to dynamic strain aging (DSA) and delayed pit propagation while the performance of the UFG alloy was related to a diffusion-mediated stress relaxation mechanism that successfully delayed crack initiation events, counteracted by exfoliation and pitting which enhanced crack initiation.

show abstract

“…Although nanocrystalline materials show greatly improved strength, they are accompanied by low ductility [25]. Therefore, keeping a certain percent coarse grain (CG) in the matrix (as in a bimodal grain size alloy) can help increase the ductility at the cost of a small reduction in strength.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of High Conductivity, High Strength Pure Copper with Ultrafine Grain Structure

Ladani,

Razmi,

Lowe

2023

JMMP

View full text Add to dashboard Cite

Applications of Copper (Cu) range from small scale applications such as microelectronics interconnects to very large high-powered applications such as railguns. In all these applications, Cu conductivity and ampacity play vital roles. In some applications such as railguns, where Cu also plays a structural role, not only is high conductivity needed, but high strength, high ductility, and high wear resistance are also critical. Current technologies have achieved their full potential for producing better materials. New approaches and technologies are needed to develop superior properties. This research examines a new fabrication approach that is expected to produce Cu with superior mechanical strength, enhanced wear resistance, and increased electrical conductivity. Materials with refined grain structures were obtained by breaking down the coarse-grained Cu particles via cryogenic ball milling, followed by the consolidation of powders using cold isostatic pressing (CIP) and subsequent Continuous Equal Channel Angular Pressing (C-ECAP). The mixture of fine and ultrafine grains, with sizes between 200 nm to 2.5 µm and an average of 500 nm, was formed after ball milling at cryogenic temperatures. Further processing via C-ECAP produced nanostructured Cu with average grain sizes below 50 nm and excellent homogenous equiaxed grain shapes and random orientations. The hardness and tensile strength of the final Cu were approximately 158% and 95% higher than the traditional coarse-grained Cu bar, respectively. This material also displayed a good electrical conductivity rate of 74% International Annealed Copper Standard (IACS), which is comparable to the current Cu materials used in railgun applications.

show abstract

Temperature dependency of mechanical behavior and strain rate sensitivity of an Al–Mg alloy with bimodal grain size

Cited by 17 publications

References 33 publications

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Slow strain rate testing and stress corrosion cracking of ultra-fine grained and conventional Al–Mg alloy

Manufacturing of High Conductivity, High Strength Pure Copper with Ultrafine Grain Structure

Contact Info

Product

Resources

About