Mechanical properties and microstructures of Al-Mg-Sc alloys

Sawtell, R. R.; Jensen, Christine C.

doi:10.1007/bf02782422

Cited by 169 publications

(73 citation statements)

References 9 publications

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“…Tensile results shown in Fig. 3 were consistent with data reported for A1-Mg-Sc alloys [2][3][4]. Compared with ambient temperature, tensile strengths increased by at least 20% at -184°C and were reduced by approximately 10% at 107°C.…”

Section: Resultssupporting

confidence: 88%

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Evaluation of Sc-Bearing Aluminum Alloy C557 for Aerospace Applications

Domack

Dicus

2002

MSF

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Section: Resultssupporting

confidence: 88%

“…The addition of scandium has been shown to increase the strength while maintaining the ductility of aluminum-magnesium alloys [2,3]. Additions of scandium and zirconium to A1-Mg alloys synergystically promote strengthening and result in higher strengths than either Sc or Zr additions produce alone [4].…”

mentioning

confidence: 99%

Evaluation of Sc-Bearing Aluminum Alloy C557 for Aerospace Applications

Domack

Dicus

2002

MSF

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“…Dilute Al-Sc alloys [1] have excellent mechanical properties at room temperature, due to the presence of elastically hard and coherent Al 3 Sc precipitates that can be obtained at a high number density [2][3][4]. These Al 3 Sc precipitates remain coherent to a diameter of 20-30 nm, since the lattice parameter mismatch is 1.25% at room temperature [5].…”

Section: Introductionmentioning

confidence: 99%

Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys

2001

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Abstract-Precipitation of the Al 3 Sc (L1 2 ) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al 3 Sc precipitates were determined for the first time by HREM, in Al-0.1 wt% Sc and Al-0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al 3 Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time) 1/3 kinetic law of Lifshitz-Slyozov-Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening. 

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“…Unfortunately, the strength of such Al-Mg alloys is lower than precipitation-hardening Al alloys. However, the addition of a small amount of scandium has been found to significantly improve the strength of Al-Mg alloys [1][2][3], owing to the presence of coherent, finely dispersed L1 2 Al 3 Sc precipitate particles that can be obtained at a high number density, thus preventing the dislocation motion. Also the Al 3 Sc particles have modest coarsening rates at elevated temperatures, leading to the effective suppression of recrystallization and the stabilization of microstructures at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microstructures on Fatigue Behavior of an Al-Mg-Sc Alloy at an Elevated Temperature

Watanabe

Monzen

2012

MSF

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Abstract. Polycrystalline Al-1wt%Mg-0.27wt%Sc alloys bearing Al 3 Sc particles with different average sizes of 4 and 11nm in diameter have been cyclically deformed at 423K under various constant stress amplitudes, and the relationship between fatigue characteristics and microstructure of the alloy has been investigated. The specimen bearing 11 nm particles exhibited a cyclic hardening to saturation, while in specimens with the small particles a cyclic softening was observed after initial hardening. In the specimen with large particles, dislocations were uniformly distributed under all applied stress amplitudes, whereas the specimens bearing small particles, in which cyclic softening occurred exhibited clearly developed slip bands. The cyclic softening for the latter specimen was explained by particle shearing within the strongly strained slip bands. The width of precipitate free zones (PFZs) has been found to be one of the factors affecting the fatigue life of the specimens at 423K. The two-step aging decreases the width of PFZs, resulting in increase in the fatigue life.

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Mechanical properties and microstructures of Al-Mg-Sc alloys

Cited by 169 publications

References 9 publications

Evaluation of Sc-Bearing Aluminum Alloy C557 for Aerospace Applications

Evaluation of Sc-Bearing Aluminum Alloy C557 for Aerospace Applications

Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys

Effects of Microstructures on Fatigue Behavior of an Al-Mg-Sc Alloy at an Elevated Temperature

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