Investigation of secondary hardening in Co-35Ni-20Cr-10Mo alloy using analytical scanning transmission electron microscopy

D. Sorensen, B. Q. Li, W. W. Gerberich, K. A. Mkhoyan

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The mechanism of secondary hardening in MP35N (Co-35Ni-20Cr-10Mo) alloy due to exposures at elevated temperatures has been studied. It was observed that short exposure to elevated temperatures increased the ultimate tensile strength and yield stress while decreasing the elongation of MP35N wires. Upon aging at temperatures from 300 to 900 C the elastic modulus increased although no changes in crystallographic orientation or microstructure were observed. The grain size and major texture components were unchanged following aging. Analytical scanning transmission electron microscope investigation showed that MP35N is hardened by preferential segregation of molybdenum to stacking faults and deformation twins. It also revealed that the concentration of molybdenum segregation was proportional to the amount of initial cold work before aging.

Original languageEnglish (US)
Pages (from-to)63-72
Number of pages10
JournalActa Materialia
Volume63
DOIs
StatePublished - Jan 15 2014

Keywords

  • Aging
  • EELS
  • MP35N
  • STEM
  • Secondary hardening

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