Effect of vanadium micro-alloying on the microstructural evolution and creep behavior of Al-Er-Sc-Zr-Si alloys

Dinc Erdeniz, Wahaz Nasim, Jahanzaib Malik, Aaron R. Yost, Sally Park, Anthony De Luca, Nhon Q. Vo, Ibrahim Karaman, Bilal Mansoor, David N. Seidman, David C. Dunand

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Al-Er-Sc-Zr-Si alloys, strengthened by L12-ordered, coherent Al3(Er,Sc,Zr) nanoscale precipitates, can be used for automotive and aerospace applications up to 400 °C. Vanadium, due to its small diffusivity in aluminum and its ability to form L12-ordered tri-aluminide precipitates, is a possible micro-alloying addition for further improving the service temperature of these alloys. Moreover, vanadium-containing Al3(Er,Sc,Zr,V) precipitates are anticipated to have a smaller lattice parameter mismatch with the matrix, thereby improving the alloy's coarsening resistance. In this study, the temporal evolution of microstructural and mechanical properties of an Al-0.005Er-0.02Sc-0.07Zr-0.06Si alloy micro-alloyed with V are investigated utilizing isochronal, isothermal and double-aging treatments and compared to the results obtained from an alloy that does not contain V, but otherwise has the same composition. Both isochronal and isothermal aging treatments reveal slower precipitation and coarsening kinetics for the V-containing alloy. A peak microhardness value of ∼600 MPa is obtained after a double-aging treatment at 350 °C/16 h, followed by aging at 400 °C for 12 h. Transmission electron microscopy reveals a duplex-size precipitate microstructure, with the smaller precipitates having a mean radius <3 nm. Despite the expectation of a reduced creep resistance due to a lower precipitate/matrix lattice mismatch, both alloys have similar creep behavior at 400 °C, characterized by a threshold stress of 7.5 and 8 MPa under peak-aged and over-aged conditions, respectively. Thus, micro-additions of V to an Al-Er-Sc-Zr-Si alloy lead to enrichment of V in the Al3(Er,Sc,Zr,V) nano-precipitates, improving their coarsening resistance without deteriorating their ability to block dislocations under creep at 400 °C.

Original languageEnglish
Pages (from-to)501-512
Number of pages12
JournalActa Materialia
Volume124
DOIs
Publication statusPublished - 1 Feb 2017

Fingerprint

Vanadium
Microstructural evolution
Alloying
Precipitates
Creep
Coarsening
Aging of materials
Lead alloys
Creep resistance
Lattice mismatch
Aerospace applications
Aluminum
Microhardness
Lattice constants
Transmission electron microscopy
Mechanical properties
Microstructure
Kinetics
Chemical analysis

Keywords

  • Aluminum alloys
  • Atom-probe tomography
  • High temperature creep
  • Microstructure
  • Precipitation strengthening

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Erdeniz, D., Nasim, W., Malik, J., Yost, A. R., Park, S., De Luca, A., ... Dunand, D. C. (2017). Effect of vanadium micro-alloying on the microstructural evolution and creep behavior of Al-Er-Sc-Zr-Si alloys. Acta Materialia, 124, 501-512. https://doi.org/10.1016/j.actamat.2016.11.033

Effect of vanadium micro-alloying on the microstructural evolution and creep behavior of Al-Er-Sc-Zr-Si alloys. / Erdeniz, Dinc; Nasim, Wahaz; Malik, Jahanzaib; Yost, Aaron R.; Park, Sally; De Luca, Anthony; Vo, Nhon Q.; Karaman, Ibrahim; Mansoor, Bilal; Seidman, David N.; Dunand, David C.

In: Acta Materialia, Vol. 124, 01.02.2017, p. 501-512.

Research output: Contribution to journalArticle

Erdeniz, D, Nasim, W, Malik, J, Yost, AR, Park, S, De Luca, A, Vo, NQ, Karaman, I, Mansoor, B, Seidman, DN & Dunand, DC 2017, 'Effect of vanadium micro-alloying on the microstructural evolution and creep behavior of Al-Er-Sc-Zr-Si alloys', Acta Materialia, vol. 124, pp. 501-512. https://doi.org/10.1016/j.actamat.2016.11.033
Erdeniz, Dinc ; Nasim, Wahaz ; Malik, Jahanzaib ; Yost, Aaron R. ; Park, Sally ; De Luca, Anthony ; Vo, Nhon Q. ; Karaman, Ibrahim ; Mansoor, Bilal ; Seidman, David N. ; Dunand, David C. / Effect of vanadium micro-alloying on the microstructural evolution and creep behavior of Al-Er-Sc-Zr-Si alloys. In: Acta Materialia. 2017 ; Vol. 124. pp. 501-512.
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AU - Nasim, Wahaz

AU - Malik, Jahanzaib

AU - Yost, Aaron R.

AU - Park, Sally

AU - De Luca, Anthony

AU - Vo, Nhon Q.

AU - Karaman, Ibrahim

AU - Mansoor, Bilal

AU - Seidman, David N.

AU - Dunand, David C.

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N2 - Al-Er-Sc-Zr-Si alloys, strengthened by L12-ordered, coherent Al3(Er,Sc,Zr) nanoscale precipitates, can be used for automotive and aerospace applications up to 400 °C. Vanadium, due to its small diffusivity in aluminum and its ability to form L12-ordered tri-aluminide precipitates, is a possible micro-alloying addition for further improving the service temperature of these alloys. Moreover, vanadium-containing Al3(Er,Sc,Zr,V) precipitates are anticipated to have a smaller lattice parameter mismatch with the matrix, thereby improving the alloy's coarsening resistance. In this study, the temporal evolution of microstructural and mechanical properties of an Al-0.005Er-0.02Sc-0.07Zr-0.06Si alloy micro-alloyed with V are investigated utilizing isochronal, isothermal and double-aging treatments and compared to the results obtained from an alloy that does not contain V, but otherwise has the same composition. Both isochronal and isothermal aging treatments reveal slower precipitation and coarsening kinetics for the V-containing alloy. A peak microhardness value of ∼600 MPa is obtained after a double-aging treatment at 350 °C/16 h, followed by aging at 400 °C for 12 h. Transmission electron microscopy reveals a duplex-size precipitate microstructure, with the smaller precipitates having a mean radius <3 nm. Despite the expectation of a reduced creep resistance due to a lower precipitate/matrix lattice mismatch, both alloys have similar creep behavior at 400 °C, characterized by a threshold stress of 7.5 and 8 MPa under peak-aged and over-aged conditions, respectively. Thus, micro-additions of V to an Al-Er-Sc-Zr-Si alloy lead to enrichment of V in the Al3(Er,Sc,Zr,V) nano-precipitates, improving their coarsening resistance without deteriorating their ability to block dislocations under creep at 400 °C.

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KW - Aluminum alloys

KW - Atom-probe tomography

KW - High temperature creep

KW - Microstructure

KW - Precipitation strengthening

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