Abstract
Cu47Ti34Zr11Ni8, Cu47Ti33Zr11Ni8Fe1 and Cu47Ti33Zr11Ni8Si1 bulk glassy alloys were prepared by injection copper mold casting. Mechanical properties, glass-forming ability, thermal stability and microstructural characteristics of as-cast rods were investigated. Calorimetric studies indicate a beneficial role of small Si or Fe addition on the thermal stability of Cu–Ti – Zr –Ni bulk glassy alloys. Compression tests reveal fracture strengths of 2040 to 2190 MPa, Young’s moduli of 100 to 109 GPa and elastic strains up to 2.4 %. The Si-containing glassy alloy exhibits a plastic elongation of 2.2%. The significant increase in plasticity observed for the Si-containing alloy is due to a special bimodal composite structure consisting of nano-scaled Cu crystals homogeneously dispersed in the bulk metallic glass matrix. The increase of the global plasticity can be explained by the formation of multiple shear bands that make the glassy alloy resistant to crack propagation.
Abstract
Cu47Ti34Zr11Ni8, Cu47Ti33Zr11Ni8Fe1 und Cu47Ti33Zr11Ni8Si1 massivglasbildende Legierungen wurden durch langsames Abkühlen in eine Kupferkokille hergestellt. Die mechanischen Eigenschaften, die Glasbildungsfähigkeit, die thermische Stabilität sowie die Mikrostruktur der gegossenen Stäbe wurden mittels unterschiedlicher Methoden charakterisiert. Kalorimetrische Untersuchungen belegen den günstigen Einfluss kleiner Zusätze von Si oder Fe hinsichtlich der thermischen Stabilität der Cu–Ti – Zr – Ni-Massivgläser. Druckversuche bei Raumtemperatur ergeben Bruchfestigkeiten von 2040 bis 2190 MPa, Elastizitätsmoduli im Bereich von 100 bis 109 GPa sowie einen elastischen Bereich von bis zu 2.4%. Das Si-haltigeMassivglas weist eine plastische Verformung von 2.2% vor dem Bruch auf. Die für die Si-haltige Legierung beobachtete ausgeprägte Plastizität ist durch eine spezielle bimodale Komposit-Struktur aus nanoskaligen Cu-Ausscheidungen, die homogen in der massivglasbildenden Matrix verteilt vorliegen, bedingt. Der Anstieg der plastischen Verformbarkeit lässt sich auf die Bildung einer Vielzahl von Scherbändern zurückführen, die den Rissfortschritt in der metallischen Glas-Matrix behindern.
Dedicated to Professor Dr. Otmar Vöhringer on the occasion of his 65th birthday
The authors thank H. Grahl, A. Güth, M. Stoica, C. Mickel, S. Schinnerling, H.-J. Klauß, H. Kempe, S. Müller and S. Kuszinski for technical assistance. Thanks are also extended to the Saxonian Ministry for Science and Art for financial support.
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© 2003 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles/Aufsätze
- On the dislocation mechanisms of dynamic strain ageing in fatigued plain carbon steels
- Effect of the γ’ volume fraction on the creep strength of Ni-base superalloys
- Auswirkung von Ausscheidungen auf das bestrahlungsinduzierte Schwellverhalten und die Hochtemperaturversprödung in dem austenitischen Stahl X10 CrNiMoTiB 15 15
- Fatigue life and cyclic deformation behaviour of quenched and tempered steel AISI 4140 at two-step stress- and total-strain-controlled push–pull loading
- Untersuchungen zur Anrisslebensdauervorhersage gekerbter Proben mit dem örtlichen Konzept am Beispiel des Stahls Cm15
- Bewertung des Ermüdungsverhaltens von Radstählen anhand von Dehnungs-, Temperatur- und Widerstandsmessungen
- On the nature of internal interfaces in tempered martensite ferritic steels
- Ermittlung von Grenzformänderungskurven an laser- und elektronenstrahlgeschweißten Stahlblechplatinen
- Point defects, precipitates and the strength anomaly in ordered Fe–Al alloys
- Isothermal high-temperature fatigue behaviour of a near-γ titanium aluminide alloy
- Slow fatigue crack growth in 2024-T3 and Ti-6Al-4V at low and ultrasonic frequency
- Structural evolution during the cycling of NiTi shape memory alloys
- Phase transformations due to isochronal annealing of Mg – rare earth – Sc–Mn squeeze cast alloys
- Isothermal strain-controlled quasi-static and cyclic deformation behavior of magnesium wrought alloy AZ31
- Microstructure of die-cast alloys Mg–Zn–Al(–Ca): a study by electron microscopy and small-angle neutron scattering
- TEM study of the dislocation structure at the transition from discontinuous to viscous glide in Cu–Al and Cu–Mn alloys at elevated temperatures
- Application of electron backscatter diffraction in the SEM to textural problems of coated high-temperature superconductors
- Oxide dispersion-strengthened silver: manufacturing and properties
- Integrative finite element simulation of the rolling of Al alloys with coupled dislocation density and texture models
- Microstructure, surface topography and mechanical properties of slip cast and powder injection moulded microspecimens made of zirconia
- Thermisch leitfähig modifizierte Funktionskunststoffe
- Tailoring nanocrystalline materials towards potential applications
- High-strength Cu–Ti-rich bulk metallic glasses and nano-composites
- Nanoskalige Schutzschichten für hochbeanspruchte Werkzeuge und Bauteile
- Prediction of the critical conditions for dynamic recrystallization in metals
- Notifications/Mitteilungen
- Personal/Personelles
- Conferences/Konferenzen
Articles in the same Issue
- Frontmatter
- Editorial
- Editorial
- Articles/Aufsätze
- On the dislocation mechanisms of dynamic strain ageing in fatigued plain carbon steels
- Effect of the γ’ volume fraction on the creep strength of Ni-base superalloys
- Auswirkung von Ausscheidungen auf das bestrahlungsinduzierte Schwellverhalten und die Hochtemperaturversprödung in dem austenitischen Stahl X10 CrNiMoTiB 15 15
- Fatigue life and cyclic deformation behaviour of quenched and tempered steel AISI 4140 at two-step stress- and total-strain-controlled push–pull loading
- Untersuchungen zur Anrisslebensdauervorhersage gekerbter Proben mit dem örtlichen Konzept am Beispiel des Stahls Cm15
- Bewertung des Ermüdungsverhaltens von Radstählen anhand von Dehnungs-, Temperatur- und Widerstandsmessungen
- On the nature of internal interfaces in tempered martensite ferritic steels
- Ermittlung von Grenzformänderungskurven an laser- und elektronenstrahlgeschweißten Stahlblechplatinen
- Point defects, precipitates and the strength anomaly in ordered Fe–Al alloys
- Isothermal high-temperature fatigue behaviour of a near-γ titanium aluminide alloy
- Slow fatigue crack growth in 2024-T3 and Ti-6Al-4V at low and ultrasonic frequency
- Structural evolution during the cycling of NiTi shape memory alloys
- Phase transformations due to isochronal annealing of Mg – rare earth – Sc–Mn squeeze cast alloys
- Isothermal strain-controlled quasi-static and cyclic deformation behavior of magnesium wrought alloy AZ31
- Microstructure of die-cast alloys Mg–Zn–Al(–Ca): a study by electron microscopy and small-angle neutron scattering
- TEM study of the dislocation structure at the transition from discontinuous to viscous glide in Cu–Al and Cu–Mn alloys at elevated temperatures
- Application of electron backscatter diffraction in the SEM to textural problems of coated high-temperature superconductors
- Oxide dispersion-strengthened silver: manufacturing and properties
- Integrative finite element simulation of the rolling of Al alloys with coupled dislocation density and texture models
- Microstructure, surface topography and mechanical properties of slip cast and powder injection moulded microspecimens made of zirconia
- Thermisch leitfähig modifizierte Funktionskunststoffe
- Tailoring nanocrystalline materials towards potential applications
- High-strength Cu–Ti-rich bulk metallic glasses and nano-composites
- Nanoskalige Schutzschichten für hochbeanspruchte Werkzeuge und Bauteile
- Prediction of the critical conditions for dynamic recrystallization in metals
- Notifications/Mitteilungen
- Personal/Personelles
- Conferences/Konferenzen