en sv fi en en en en ru cs da ar es sv ro el fa fr nl hu tr zh de pl fi vi ko it hbs_lat da th ja pt da da da sv de da fi en de sv da sv en da da da da da da eo da en da de eo en sv en en fr en en en en en en en es da it da en en es da en en da da en sv en en da da nl da da da it it da da da da nl pl en nl de en en en en en en en en en en en en en en da da da da da da da en en en en en la en en en en en da da da da da da en fr da
Dispersion Strengthened Copper (DSC) Alloys: Part One :: Total Materia Article
Institutter og den akademiske verden
Deep Drawable Steels: Part One
Thermo-Mechanical Treatment (TMT) of Non-Ferrous Alloys: Part One
DataPLUS er et supplerende data modul som leverer korrosions data, materiale samlings information, materiale dimensioner og tolerancer og belægnings informationer for tusinder af metalliske og ikke-metalliske materialer.
Klik her for at se mere.
Overview of Total Materia database 12th January 2022
Overview of Total Materia database 13th January 2022
Total Materia har ved at give os en bestemt metode tilladt os at løse alle problemerne vi havde med søgning af alternative materialer i udlandet. Takket være Total Materia har vi udstedt virkelige "internationale" specifikationer for køb af stål i fremmede lande.
Total Materia er fortsat det eneste værktøj, der vil blive brugt til dette formål.
Bonfiglioli Industrial Gearmotors, Bologna, Italia
Vores mission er simpel;
at gøre Total Materia
til det eneste destination og
første valg for ingeniører
Prof. Dr. Viktor Pocajt, CEO
Key to Metals AG
Dispersion Strengthened Copper (DSC) Alloys: Part One
Dispersion strengthening of any material is done with te aim to create a composite of superior physical properties via te dispersion of oxide particles in te metallic matrix.
High energy ball milling provides a repetitive fracture/weld method to achieve a homogeneous dispersoid distribution.
Oxides are fundamentally different than their metals. They have a much higher melting point, are normally less than half as dense, and have a significantly different electronic and crystal structure. Most differences between metals and their oxides arise from a difference in interatomic bonding. Most oxides are covalently or ionically bonded indicating that electrons are localized while in metals, electrons are delocalized and can float through te atomic lattice.
From these subtle yet important differences it is not apparent that a dispersion of fine oxide particles in a metallic matrix will create a composite with better physical properties than te original alloy, though this has been shown to be true. Te first mention of oxide dispersion strengthening in literature appears in te Transactions of te American Institute of Mining and Metallurgical Engineers in 1957. Te creep resistance of te alloys made by this process is higher than te base alloy.
Dispersion strengthening is a well-known procedure used for improving te hardness of metallic materials. Dispersoids can be introduced by a variety of methods but “Mechanical Alloying” was a breakthrough enabling obtaining of a homogeneous dispersoid distribution. Te processing route involves high-energy ball milling of te starting powder mixed with a dispersoid. Attempts have been made to produce dispersion strengthened copper by mechanical alloying using alumina particles of various sizes.
Te high-energy ball milling powder process, through repeated fracture and welding of powder particles during ball-powder-ball and ball-powder-container collisions, enables achievement of a regular distribution of fine Al2O3 particles in te copper matrix. Such Al2O3 dispersoids contribute to te copper matrix strengthening providing resistance to dislocation motion according to Orowan’s theory. Te oxide dispersion strengthened alloys, produced by mechanical alloying, are characterized by te presence of extremely small oxide dispersoids ranging from 30nm - 40nm, uniformly distributed in a very fine grain sized structure (<1um in diameter). Te aim of this work was to estimate whether commercial alumina particles with an average particle size of about 0.75um could be broken down during milling and achieve te dispersion strengthening effect in Cu-Al2O3 alloys.
Figure 1 shows te mixture of Cu+3wt.%Al2O3 powder particles before milling (Figure 1a) and te development of Cu-2.5wt.%Al particle morphology with increasing milling time (Figure 1b-d). Figure 1 shows that 3h of milling time leads to particle coarsening, while 10 and 20h of milling followed with te formation of equiaxed particles. After 3h (Figure 1b) te milled powder particles are rather flattened as a result of strong plastic deformation occurring at te very beginning of milling.
Figure 1: Morphology of Cu+3wt%Al2O3 particles: a) before milling and after different milling times: b) 3h, c) 5h, d) 10h and e) 20h
1. M.Humbert: Matt Oxide dispersion strengthened alloys, 2012, Accessed July 2017;
2. V. Rajković, O. Erić, D. Božić, M. Mitkov, E. Romhanji: Characterization of Dispersion Strengthened Copper with 3wt%Al2O3 by Mechanical Alloying, Science of Sintering, 36, 2004, p.205-211.
Skriv en sætning for at søge efter:
Finding copper materials in te Total Materia database
Te Total Materia database contains many thousands of copper materials across a large range of countries and standards.
Where available, full property information can be viewed for materials including chemical composition, mechanical properties, physical properties, advanced property data and much more.
Using te Advanced Search page, define te search criteria by selecting "Copper" in te Group of Materials pop-up list. It maybe that you need to further narrow te search criteria by using te other fields in te Advanced Search page e.g. Country/Standard.
A list of materials will then be generated for you to choose from.
After clicking a material from te resulting list, a list of subgroups derived from standard specifications appears.
From here it is possible to view specific property data for te selected material and also to view similar and equivalent materials in our powerful cross reference tables.
Click on te property data link of interest to you to view specific property data.
For you’re a chance to take a test drive of te Total Materia database, we invite you to join a community of over 150,000 registered users through te Total Materia Free Demo.
© 2022 Key to Metals AG. Alle Rettigheder Forbeholdes