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

doi:10.1016/j.actamat.2013.10.005

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

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

60 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 language	English (US)
Pages (from-to)	63-72
Number of pages	10
Journal	Acta Materialia
Volume	63
DOIs	https://doi.org/10.1016/j.actamat.2013.10.005
State	Published - Jan 15 2014

Bibliographical note

Funding Information:
The authors would like to acknowledge the Medtronic Neuromodulation leadership for financial support of this research. D.S. would also like to thank Dr. J. Schaffer of Fort Wayne Metals for helpful discussions, Dr. O. Ugurlu and Dr. J. Myers for helpful discussions and assistance with TEM, and Ms. M. Bush of Medtronic for careful proofreading of this manuscript. Parts of this work were carried out at the Characterization Facility of the University of Minnesota, which receives partial support from NSF through the MRSEC program. Parts of this work were carried out at the University of Minnesota Nano Center, which receives partial support from NSF through the NNIN program.

Keywords

Aging
EELS
MP35N
STEM
Secondary hardening

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10.1016/j.actamat.2013.10.005

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

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.",

keywords = "Aging, EELS, MP35N, STEM, Secondary hardening",

author = "D. Sorensen and Li, \{B. Q.\} and Gerberich, \{W. W.\} and Mkhoyan, \{K. A.\}",

note = "Funding Information: The authors would like to acknowledge the Medtronic Neuromodulation leadership for financial support of this research. D.S. would also like to thank Dr. J. Schaffer of Fort Wayne Metals for helpful discussions, Dr. O. Ugurlu and Dr. J. Myers for helpful discussions and assistance with TEM, and Ms. M. Bush of Medtronic for careful proofreading of this manuscript. Parts of this work were carried out at the Characterization Facility of the University of Minnesota, which receives partial support from NSF through the MRSEC program. Parts of this work were carried out at the University of Minnesota Nano Center, which receives partial support from NSF through the NNIN program.",

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doi = "10.1016/j.actamat.2013.10.005",

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AU - Sorensen, D.

AU - Li, B. Q.

AU - Gerberich, W. W.

AU - Mkhoyan, K. A.

N1 - Funding Information: The authors would like to acknowledge the Medtronic Neuromodulation leadership for financial support of this research. D.S. would also like to thank Dr. J. Schaffer of Fort Wayne Metals for helpful discussions, Dr. O. Ugurlu and Dr. J. Myers for helpful discussions and assistance with TEM, and Ms. M. Bush of Medtronic for careful proofreading of this manuscript. Parts of this work were carried out at the Characterization Facility of the University of Minnesota, which receives partial support from NSF through the MRSEC program. Parts of this work were carried out at the University of Minnesota Nano Center, which receives partial support from NSF through the NNIN program.

PY - 2014/1/15

Y1 - 2014/1/15

N2 - 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.

AB - 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.

KW - Aging

KW - EELS

KW - MP35N

KW - STEM

KW - Secondary hardening

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DO - 10.1016/j.actamat.2013.10.005

M3 - Article

AN - SCOPUS:84888292499

SN - 1359-6454

VL - 63

SP - 63

EP - 72

JO - Acta Materialia

JF - Acta Materialia

ER -

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

Abstract

Bibliographical note

Keywords

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