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Optimisation of deformation properties in as-cast copper by microstructural engineering. Part II. Mechanical properties
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
School of Material Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
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2020 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 812, article id 151910Article in journal (Refereed) Published
Abstract [en]

The microstructure evolution in the as-cast pure Cu and Cu-(1.0–3.0)Fe-0.5Co and Cu-1.5Fe-0.1Sn (wt. %) alloys was characterised in the previous work. Herein, the plastic deformation characteristics were examined by uniaxial tensile tests at room temperature. Along with the microstructure evolution, the yield strength increased with increasing Fe content and reached a peak value at 1.5 wt % Fe, but thereafter decreased with the further addition of Fe in the Cu–Fe–Co alloys. Nevertheless, the tensile strength and elongation synchronously improve with increasing Fe content. In particular, the Cu-1.5Fe-0.1Sn alloy achieved the optimal strength–ductility combination. In terms of the strengthening mechanism, the (Fe, Co)- or (Fe, Sn)-doped copper encouraged impediment, trapping, and storage of dislocations by the iron-rich nanoparticles and grain boundaries, which enhanced the strength and sustained the work hardening and elongation. The evolution of mechanical properties under an alloying effect was quantitatively described by the strengthening models. The results indicate that the optimum balance between strength and ductility was achieved by designing a microstructure containing fine grains, intragranular smaller spherical nanoparticles, and a minor solute element with higher misfit and higher growth restriction effect. The necessities for engineering a microstructure to achieve simultaneously strong and ductile bulk metals were discussed.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 812, article id 151910
Keywords [en]
Casting, Copper, Iron-rich nanoparticle, Mechanical behaviour, Microstructure design, Cobalt alloys, Copper alloys, Ductility, Grain boundaries, Microstructure, Nanoparticles, Strain hardening, Strengthening (metal), Tensile strength, Tensile testing, Ternary alloys, Tin alloys, Deformation Characteristics, Iron rich, Micro-structure evolutions, Microstructural engineering, Strength and ductilities, Strengthening mechanisms, Iron alloys
National Category
Metallurgy and Metallic Materials
Research subject
Metallurgical process science
Identifiers
URN: urn:nbn:se:kth:diva-263434DOI: 10.1016/j.jallcom.2019.151910ISI: 000490423000049Scopus ID: 2-s2.0-85071875799OAI: oai:DiVA.org:kth-263434DiVA, id: diva2:1375600
Note

QC 20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-06Bibliographically approved

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Chen, KaixuanSandström, Rolf

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