Advertisement

Initial weldability study on Al0.5CrCoCu0.1FeNi high-entropy alloy

  • Alexander C. Martin
  • Carolin FinkEmail author
Research Paper
  • 26 Downloads

Abstract

The weld solidification behavior, segregation tendency, phase formation, and cracking susceptibility of Al0.5CoCrCu0.1FeNi high-entropy alloy (HEA) were investigated. The AlCoCrCuFeNi alloy system has received wide attention due to its high temperature stability and strength retention. Characterization of the as-melted, heat-treated, and hot-rolled and heat-treated alloy conditions was performed and compared to thermodynamic CALPHAD-based calculations. Autogenous gas tungsten arc (GTA) and laser beam welding was done on the different alloy conditions. Microstructural changes in the fusion zone and heat-affected zone (HAZ) were investigated by optical microscopy and micro-hardness. Hot cracking susceptibility was evaluated using the cast pin tear test (CPTT). The fusion zone solidification microstructure of Al0.5CoCrCu0.1FeNi alloy consists of primary face centered cubic dendrites and interdendritic body centered cubic phase that forms at the end of solidification. GTA welding results in the partial dissolution of the interdendritic phase in the high-temperature HAZ, adjacent to the fusion boundary. Welding on the heat-treated alloy leads to HAZ softening due to the dissolution of strengthening nano-sized precipitates. No solidification cracking or HAZ liquation cracking was observed. Laser welding did not result in a drop in hardness or significant microstructural changes in the HAZ. The CPTT results correspond well with the predicted solidification temperature range (141 K) for Al0.5CoCrCu0.1FeNi alloy and its overall good weldability that was observed in the present work.

Keywords

High-entropy alloys Weldability Gas tungsten arc welding Laser welding 

Notes

Funding information

The authors gratefully acknowledge the partial financial support for this research by the Institute of Materials Research at Ohio State University under an Exploratory Materials Research Grant and by the American Welding Society under an AWS Graduate Research Fellowship Grant.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

References

  1. 1.
    Yeh J-W, Chen SK, Lin SJ, Gan JY, Chin TS, Shun TT, Tsau CH, Chang SY (2004) Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes. Adv Eng Mater 6(5):299–303CrossRefGoogle Scholar
  2. 2.
    Cantor B, Chang ITH, Knight P, Vincent AJB (2004) Microstructural development in equiatomic multicomponent alloys. Mater Sci Eng A 375–377:213–218CrossRefGoogle Scholar
  3. 3.
    Hsu C-Y, Yeh J-W, Chen S-K, Shun T-T (2004) Wear resistance and high-temperature compression strength of Fcc CuCoNiCrAl0.5Fe alloy with boron addition. Metall Mater Trans A 35(5):1465–1469CrossRefGoogle Scholar
  4. 4.
    Miracle DB, Senkov ON (2017) A critical review of high entropy alloys and related concepts. Acta Mater 122:448–511CrossRefGoogle Scholar
  5. 5.
    Chen H-L, Mao H, Chen Q (2018) Database development and Calphad calculations for high entropy alloys: challenges, strategies, and tips. Mater Chem Phys 210:279–290CrossRefGoogle Scholar
  6. 6.
    Ye YF, Wang Q, Lu J, Liu CT, Yang Y (2016) High-entropy alloy: challenges and prospects. Mater Today 19(6):349–362CrossRefGoogle Scholar
  7. 7.
    Tsai M-H, Yeh J-W (2014) High-entropy alloys: a critical review. Materials Research Letters 2(3):107–123.  https://doi.org/10.1080/21663831.2014.912690 CrossRefGoogle Scholar
  8. 8.
    Martin AC, Oliveira JP, Fink C (2018) Elemental effects on weld cracking susceptibility in AlxCoCrCuyFeNi high entropy alloy. Not yet publishedGoogle Scholar
  9. 9.
    Wang W-R, Wang W-L, Yeh J-W (2014) Phases, microstructure and mechanical properties of AlxCoCrFeNi high-entropy alloys at elevated temperatures. J Alloys Compd 589:143–152CrossRefGoogle Scholar
  10. 10.
    Tong C-J, Chen MR, Yeh JW, Lin SJ, Chen SK, Shun TT, Chang SY (2005) Mechanical performance of the Al x CoCrCuFeNi high-entropy alloy system with multiprincipal elements. Metall Mater Trans A 36(5):1263–1271CrossRefGoogle Scholar
  11. 11.
    Niu S, Kou H, Guo T, Zhang Y, Wang J, Li J (2016) Strengthening of nanoprecipitations in an annealed Al0.5CoCrFeNi high entropy alloy. Mater Sci Eng A 671:82–86CrossRefGoogle Scholar
  12. 12.
    Alexandrov BT, Lippold JC (2013) Use of the cast pin tear test to study solidification cracking. Welding in the World 57(5):635–648CrossRefGoogle Scholar
  13. 13.
    Vander Voort G, Manilova E (2004) Metallographic techniques for superalloys. Microsc Microanal 10(S02):690–691CrossRefGoogle Scholar
  14. 14.
    Wang W-R, Wang W-L, Wang S-C, Tsai Y-C, Lai C-H, Yeh J-W (2012) Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys. Intermetallics 26:44–51CrossRefGoogle Scholar
  15. 15.
    Singh S, Wanderka N, Murty BS, Glatzel U, Banhart J (2011) Decomposition in multi-component AlCoCrCuFeNi high-entropy alloy. Acta Mater 59(1):182–190CrossRefGoogle Scholar
  16. 16.
    Jantzen CMF, Herman H (1978) Spinodal decomposition–phase diagram representation and occurence, In: Phase diagrams: materials science and technology, pp 127–184. https://www.sciencedirect.com/science/article/pii/B9780120532056500115?via%3Dihub. Accessed 28 Jan 2019
  17. 17.
    Hu B, Richardson IM (2006) Mechanism and possible solution for transverse solidification cracking in laser welding of high strength aluminium alloys. Mater Sci Eng A 429(1–2):287–294CrossRefGoogle Scholar
  18. 18.
    Bergmann JP, Bielenin M, Herzog RA, Hildebrand J, Riedel I, Schricker K, Trunk C, Worthmann K (2017) Prevention of solidification cracking during pulsed laser beam welding. PAMM 17(1):405–406CrossRefGoogle Scholar
  19. 19.
    Loginova I, Khalil A, Pozdniakov A, Solonin A, Zolotorevskiy V (2017) Effect of pulse laser welding parameters and filler metal on microstructure and mechanical properties of Al-4.7Mg-0.32Mn-0.21Sc-0.1Zr alloy. Metals 7(12):564CrossRefGoogle Scholar

Copyright information

© International Institute of Welding 2019

Authors and Affiliations

  1. 1.Welding Engineering ProgramThe Ohio State UniversityColumbusUSA

Personalised recommendations