Work hardening behavior of dual phase copper–iron alloy at low temperature

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2021-07, Vol.819, p.141509, Article 141509
• Main Authors: Yamashita, Takayuki, Koga, Norimitsu, Kawasaki, Takuro, Morooka, Satoshi, Tomono, Shohei, Umezawa, Osamu, Harjo, Stefanus
• Format: Article
• Language: English
• Subjects: Alloys; Cold rolling; Copper; Copper base alloys; Deformation; Dual phase alloy; Hardening rate; Iron; Low temperature; Neutron diffraction; Phase stress; Stress partition; Temperature; Temperature dependence; Tensile tests; True stress; Work hardening
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2021.141509

In-situ neutron diffraction measurements were performed on a cold-rolled copper-iron (Cu–Fe) alloy during tensile tests at 293 K and 150 K. The alloy was composed of face-centered cubic Cu and body-centered cubic Fe. The roles of Cu and Fe on the deformation behavior of alloys were discussed and clarified. The strength and work-hardening rate of the alloy increased with decreasing test temperature. Furthermore, the phase stress of Fe increased considerably with decreasing test temperature; however, the response of this stress to the applied true stress exhibited no dependence on the temperature. The phase stresses of Cu changed only slightly with decreasing test temperature. However, the Cu phase stress response to the applied true stress increased with decreasing test temperature, indicating an increase in the work-hardening rate. The strengthening of Fe and the increase in the work-hardening of Cu contributed to an increase in the strength and work-hardening rate of the Cu–Fe alloy at low temperatures. •Cu-40 mass% Fe dual phase alloy was deformed at 293 K and 150 K.•In situ neutron diffraction measurements and peak profile analysis were performed.•Roles of Cu and Fe in deformation behavior at both temperatures were discussed.•Phase stress of Fe was larger than that of Cu, and increased notably at 150 K.•Work hardening of Cu was larger than that of Fe, and increased at 150 K.