Fatigue properties of Cu-Cr in situ composite

Chitoshi Masuda, Yoshihisa Tanaka

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The new electrical conductive material, Cu-15 mass%Cr in situ composite, has been developed for the application to lead frame, high field magnet and trolley wire. The Cu-Cr composite was fabricated by casting method in vacuum and forged, solution-treated and cold drawn. The value of the cold drawing strains, η, for the composite were 4.66 and 6.94. η is defined by the value of ln(A0/A), where A0 and A are virgin area and final area of material, respectively. The cold drawn Cu-Cr composite was tested using a rotating bending fatigue testing machine and axial loading fatigue testing machine (R = 0.1, where R is stress ratio of minimum stress to maximum stress) at room temperature in comparison to the data for pure copper. The fatigue stresses decreased with increasing number of cycles to failure. The double-knees, which have been found in other face centered cubic materials, such as aluminum alloys, were not seen on the S-N curves for both alloys. The fatigue strength of Cu-Cr composite was twice higher than that for pure copper. The fatigue strength of Cu-Cr composite cold drawn up to η = 6.94 was higher than that drawn up to η = 4.66 when tested under an axial loading. In the fatigue fracture surface, the fatigue crack initiated from the un-dissolved chromium particle situated beneath the specimen surface and the crack direction was changed along the chromium fiber. It was suggested that, in order to improve the fatigue strength of Cu-Cr composite, it is very important to reduce the size and amount of un-dissolved chromium particles.

Original languageEnglish
Pages (from-to)1426-1434
Number of pages9
JournalInternational Journal of Fatigue
Volume28
Issue number10 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Oct

Fingerprint

Fatigue
Composite
Fatigue of materials
Composite materials
Fatigue Strength
Chromium
Fatigue testing
Copper
S-N Curve
Conductive materials
Testing
Fatigue Crack
Aluminum Alloy
Casting
Magnets
Aluminum alloys
Rotating
Crack
Vacuum
Fiber

Keywords

  • Cu-Cr in situ composite
  • Fatigue crack propagation mechanism
  • Fatigue properties
  • High strength and high electric materials

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Fatigue properties of Cu-Cr in situ composite. / Masuda, Chitoshi; Tanaka, Yoshihisa.

In: International Journal of Fatigue, Vol. 28, No. 10 SPEC. ISS., 10.2006, p. 1426-1434.

Research output: Contribution to journalArticle

Masuda, Chitoshi ; Tanaka, Yoshihisa. / Fatigue properties of Cu-Cr in situ composite. In: International Journal of Fatigue. 2006 ; Vol. 28, No. 10 SPEC. ISS. pp. 1426-1434.
@article{38832cf0a55c425fb921a519cfc1fcbf,
title = "Fatigue properties of Cu-Cr in situ composite",
abstract = "The new electrical conductive material, Cu-15 mass{\%}Cr in situ composite, has been developed for the application to lead frame, high field magnet and trolley wire. The Cu-Cr composite was fabricated by casting method in vacuum and forged, solution-treated and cold drawn. The value of the cold drawing strains, η, for the composite were 4.66 and 6.94. η is defined by the value of ln(A0/A), where A0 and A are virgin area and final area of material, respectively. The cold drawn Cu-Cr composite was tested using a rotating bending fatigue testing machine and axial loading fatigue testing machine (R = 0.1, where R is stress ratio of minimum stress to maximum stress) at room temperature in comparison to the data for pure copper. The fatigue stresses decreased with increasing number of cycles to failure. The double-knees, which have been found in other face centered cubic materials, such as aluminum alloys, were not seen on the S-N curves for both alloys. The fatigue strength of Cu-Cr composite was twice higher than that for pure copper. The fatigue strength of Cu-Cr composite cold drawn up to η = 6.94 was higher than that drawn up to η = 4.66 when tested under an axial loading. In the fatigue fracture surface, the fatigue crack initiated from the un-dissolved chromium particle situated beneath the specimen surface and the crack direction was changed along the chromium fiber. It was suggested that, in order to improve the fatigue strength of Cu-Cr composite, it is very important to reduce the size and amount of un-dissolved chromium particles.",
keywords = "Cu-Cr in situ composite, Fatigue crack propagation mechanism, Fatigue properties, High strength and high electric materials",
author = "Chitoshi Masuda and Yoshihisa Tanaka",
year = "2006",
month = "10",
doi = "10.1016/j.ijfatigue.2006.02.051",
language = "English",
volume = "28",
pages = "1426--1434",
journal = "International Journal of Fatigue",
issn = "0142-1123",
publisher = "Elsevier Limited",
number = "10 SPEC. ISS.",

}

TY - JOUR

T1 - Fatigue properties of Cu-Cr in situ composite

AU - Masuda, Chitoshi

AU - Tanaka, Yoshihisa

PY - 2006/10

Y1 - 2006/10

N2 - The new electrical conductive material, Cu-15 mass%Cr in situ composite, has been developed for the application to lead frame, high field magnet and trolley wire. The Cu-Cr composite was fabricated by casting method in vacuum and forged, solution-treated and cold drawn. The value of the cold drawing strains, η, for the composite were 4.66 and 6.94. η is defined by the value of ln(A0/A), where A0 and A are virgin area and final area of material, respectively. The cold drawn Cu-Cr composite was tested using a rotating bending fatigue testing machine and axial loading fatigue testing machine (R = 0.1, where R is stress ratio of minimum stress to maximum stress) at room temperature in comparison to the data for pure copper. The fatigue stresses decreased with increasing number of cycles to failure. The double-knees, which have been found in other face centered cubic materials, such as aluminum alloys, were not seen on the S-N curves for both alloys. The fatigue strength of Cu-Cr composite was twice higher than that for pure copper. The fatigue strength of Cu-Cr composite cold drawn up to η = 6.94 was higher than that drawn up to η = 4.66 when tested under an axial loading. In the fatigue fracture surface, the fatigue crack initiated from the un-dissolved chromium particle situated beneath the specimen surface and the crack direction was changed along the chromium fiber. It was suggested that, in order to improve the fatigue strength of Cu-Cr composite, it is very important to reduce the size and amount of un-dissolved chromium particles.

AB - The new electrical conductive material, Cu-15 mass%Cr in situ composite, has been developed for the application to lead frame, high field magnet and trolley wire. The Cu-Cr composite was fabricated by casting method in vacuum and forged, solution-treated and cold drawn. The value of the cold drawing strains, η, for the composite were 4.66 and 6.94. η is defined by the value of ln(A0/A), where A0 and A are virgin area and final area of material, respectively. The cold drawn Cu-Cr composite was tested using a rotating bending fatigue testing machine and axial loading fatigue testing machine (R = 0.1, where R is stress ratio of minimum stress to maximum stress) at room temperature in comparison to the data for pure copper. The fatigue stresses decreased with increasing number of cycles to failure. The double-knees, which have been found in other face centered cubic materials, such as aluminum alloys, were not seen on the S-N curves for both alloys. The fatigue strength of Cu-Cr composite was twice higher than that for pure copper. The fatigue strength of Cu-Cr composite cold drawn up to η = 6.94 was higher than that drawn up to η = 4.66 when tested under an axial loading. In the fatigue fracture surface, the fatigue crack initiated from the un-dissolved chromium particle situated beneath the specimen surface and the crack direction was changed along the chromium fiber. It was suggested that, in order to improve the fatigue strength of Cu-Cr composite, it is very important to reduce the size and amount of un-dissolved chromium particles.

KW - Cu-Cr in situ composite

KW - Fatigue crack propagation mechanism

KW - Fatigue properties

KW - High strength and high electric materials

UR - http://www.scopus.com/inward/record.url?scp=33745959747&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745959747&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2006.02.051

DO - 10.1016/j.ijfatigue.2006.02.051

M3 - Article

AN - SCOPUS:33745959747

VL - 28

SP - 1426

EP - 1434

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

IS - 10 SPEC. ISS.

ER -