Processing and Characterization of Yttria-Dispersed INCONEL 718 ODS Alloy

  • M. S. DhanyaEmail author
  • A. K. Shukla
  • S. Dineshraj
  • Ravi Ranjan Kumar
  • K. Prabhakaran
  • S. V. S. Narayana Murty
  • P. Ramesh Narayanan
Technical Paper


Oxide dispersion strengthening is an effective method to improve the high-temperature mechanical properties of the alloys in which various reinforcements are added in the alloy matrix by mechanical milling and consolidating the mixture by different techniques like hot pressing, hot isostatic pressing and spark plasma sintering. This work presents the development of IN 718 ODS alloy by dispersing yttria in IN 718, which has improved mechanical properties at high temperatures. Yttria powder was added to IN 718 alloy powder in different weight fractions of 0.25, 0.5 and 1% and mechanically milled. The composite powders were consolidated by hot pressing and hot isostatic pressing (HIP). A small fraction of isolated porosities in the matrix was observed in hot-pressed samples which caused degradation of the mechanical properties. Percentage of porosities increased with the increase in yttria content. The hot-pressed samples were HIPed to heal the porosities. 0.5 wt% yttria-dispersed Inconel 718 hot-pressed compact exhibited better properties at 850 °C and showed 50 MPa improvement in ultimate compressive strength compared to Inconel 718 alloy.


IN 718 ODS alloy Mechanical milling Hot pressing (HP) Hot isostatic pressing (HIP) 



The authors wish to thank Director, VSSC, for his permission to publish the work.


  1. 1.
    Geddes B, Leon H, and Huang X, Super AlloysAlloying and Performance, ASM International, Geauga County (2010).Google Scholar
  2. 2.
    Elevated Temperature Characteristics of Engineering Materials, Heat Resistant Materials, ASM Specialty Handbook.Google Scholar
  3. 3.
    Khalaj O, Masek B, Jirkova H, and Svoboda J, Int J Mater Metall Eng 11 (2017) 501.Google Scholar
  4. 4.
    Mohan M, Subramanian R, Alam M Z, and Angelo P C, Mater Technol 48 (2014) 899.Google Scholar
  5. 5.
    Pasebani S, Dutt A K, Burns J, Charit I, and Mishra R S, Mater Sci Eng A 630 (2015) 155.CrossRefGoogle Scholar
  6. 6.
    van de Voorde M H, Butil Soc Cat Cien XI (1991) 199.Google Scholar
  7. 7.
    Ricks R A, Porter A J, and Ecob R C, Acta Metall 31 (1983) 43.CrossRefGoogle Scholar
  8. 8.
    Capdevila C, Chen Y L, Jones A R, and Bhadeshia H K D H, ISIJ Int 43 (2003) 777.CrossRefGoogle Scholar

Copyright information

© The Indian Institute of Metals - IIM 2019

Authors and Affiliations

  • M. S. Dhanya
    • 1
    Email author
  • A. K. Shukla
    • 1
  • S. Dineshraj
    • 1
  • Ravi Ranjan Kumar
    • 2
  • K. Prabhakaran
    • 3
  • S. V. S. Narayana Murty
    • 1
  • P. Ramesh Narayanan
    • 1
  1. 1.Vikram Sarabhai Space CentreTrivandrumIndia
  2. 2.Liquid Propulsion Systems CenterValiamala, TrivandrumIndia
  3. 3.Indian Institute of Space Science and TechnologyValiamala, TrivandrumIndia

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