Embrittlement Phenomena in Copper and Cupronickel Alloys
D. Empl, V. Laporte, L. Felberbaum and A. Mortensen
The goal of this study, funded by a collaboration between the Swiss agency KTI/CTI and the Swissmetal company was to improve our understanding of cracking phenomena observed in the hot deformation processing of Cu-Ni alloys that may contain further alloy elements, in particular lead. The main axes of enquiry were: (i) measurement of capillary forces at inclusions of added lead using a newly developed technique based on three-dimensional reconstruction of the inclusion/matrix interface; (ii) mechanical tests between room temperature and 900 °C over a wide range of strain rates.
Laboratory grade alloys are cast in an argon atmosphere. The material is successively extruded, cold drawn, heat treated and tensile or creep tested at intermediate temperature.
Liquid as well as Solid Metal Embrittlement are operating in alloys containing lead, depending on temperature and strain rate used in the mechanical test. The ductility and strength of the alloy are much reduced around 400°C as compared to Cu OFHC. Alloys of Cu-Ni-Si are prone to grain boundary embrittlement by oxygen and sulfur at low strain rates.
Scientific articles from this work:
Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2010
Measurement and anisotropy of grain boundary energy in Cu-1 wt.% PB
Scripta Materialia. 2010. Vol. 62, p. 262-265. DOI : 10.1016/j.scriptamat.2009.11.012.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2010
Improvement of elevated temperature mechanical properties of Cu–Ni–Sn–Pb alloys
Materials Science and Engineering: A. 2010. Vol. 527, num. 16-17, p. 4326-4333. DOI : 10.1016/j.msea.2010.03.056.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2009
Dihedral Angles in Cu-1wt.%Pb: Grain Boundary Energy and Grain Boundary Triple Line Effects
Acta Materialia. 2009. Vol. 57, num. 8, p. 2527-2537. DOI : 10.1016/j.actamat.2009.02.009.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2009
Intermediate temperature grain boundary phenomena in copper alloys
Lausanne, EPFL, 2009.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2008
Equilibrium shape of a liquid intergranular inclusion in a stressed elastic solid
Scripta Materialia. 2008. Vol. 58, num. 7, p. 610-613. DOI : 10.1016/j.scriptamat.2007.11.024.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.
2006
Capillary shape equilibration of liquid inclusions embedded in a partly soluble solid
Scripta Materialia. 2006. Vol. 55, num. 10, p. 955. DOI : 10.1016/j.scriptamat.2006.06.036.Please note that the publication lists from Infoscience integrated into the EPFL website, lab or people pages are frozen following the launch of the new version of platform. The owners of these pages are invited to recreate their publication list from Infoscience. For any assistance, please consult the Infoscience help or contact support.