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Online since: April 2018
Authors: Kazuhiro Nogita, Stuart D. McDonald, Mohd Arif Anuar Mohd Salleh, Xin Fu Tan
It has a higher volume fraction of Cu6Sn5 in the bulk solder due to the higher Cu content in the alloy compared to most conventional solder alloys.
The effect of trace addition of many different elements to Sn-Ag-Cu and Sn-Cu alloys were reported [2,6,7], but there is currently no report on the effect of trace Mg addition to the Sn-Ag-Cu or Sn-Cu alloys in the literature.
This research aims to study the effect of trace Al and Mg addition on the microstructure of Cu6Sn5 intermetallic and Sn/Ag3Sn eutectic in Sn-3wt%Ag-5wt%Cu solder alloys.
The finer Cu6Sn5 microstructure will improve the mechanical properties of the solder alloys.
Gourlay: Journal of Alloys and Compounds Vol. 619 (2015), p. 345 [2] S.
The effect of trace addition of many different elements to Sn-Ag-Cu and Sn-Cu alloys were reported [2,6,7], but there is currently no report on the effect of trace Mg addition to the Sn-Ag-Cu or Sn-Cu alloys in the literature.
This research aims to study the effect of trace Al and Mg addition on the microstructure of Cu6Sn5 intermetallic and Sn/Ag3Sn eutectic in Sn-3wt%Ag-5wt%Cu solder alloys.
The finer Cu6Sn5 microstructure will improve the mechanical properties of the solder alloys.
Gourlay: Journal of Alloys and Compounds Vol. 619 (2015), p. 345 [2] S.
Online since: December 2016
Authors: Jaroslav Málek, Stanislav Daniš, Zdeněk Tolde, Ladislav Cvrček, Jan Krčil, Vladimír Starý
Characterization of TiNb Films on Ti Alloys for Hard Tissue Replacement
Vladimír Starý1, Ladislav Cvrček1, Stanislav Daniš2, Jan Krčil1,
Jaroslav Málek1, Zdeněk Tolde1
1Department of Materials Engineering, Faculty of Mechanical Engineering, CTU in Prague,
Karlovo nám. 13, Prague
2Department of Condensed Matter Physics, Faculty of Mathematics and Physics,
Charles University in Prague, Ke Karlovu 5, Prague
astary@fsik.cvut.cz, bdanis@mag.mff.cuni.cz
Keywords: binary Ti alloys, thin films, structure, mechanical properties, nanoindentation
Abstract.
These layers were prepared on substrates made from Ti, Ti alloys (Ti39Nb and Ti6Al4V) and stainless steel AISI316.
Introduction Low-modulus β-TiNb alloys (the TiNb binary system with a BCC structure) with excellent corrosion resistance are currently under consideration as a surgical implant material [1,2].
The advantage of using of a binary alloy is that it is simpler to preserve the composition than in the case of ternary and quaternary alloys, which induce obviously non-homogeneous segregation of elements [4].
Zhao: Journal of Alloys and Compounds Vol. 644 (2015), p. 411 [5] S.
These layers were prepared on substrates made from Ti, Ti alloys (Ti39Nb and Ti6Al4V) and stainless steel AISI316.
Introduction Low-modulus β-TiNb alloys (the TiNb binary system with a BCC structure) with excellent corrosion resistance are currently under consideration as a surgical implant material [1,2].
The advantage of using of a binary alloy is that it is simpler to preserve the composition than in the case of ternary and quaternary alloys, which induce obviously non-homogeneous segregation of elements [4].
Zhao: Journal of Alloys and Compounds Vol. 644 (2015), p. 411 [5] S.
Online since: January 2010
Authors: E. Bischoff, Eric Jan Mittemeijer, R.E. Schacherl, S. Meka
An unusual plate-type morphology of γ-Fe4N1-x was
observed, contrasting with the usual continuous layer-type growth observed upon nitriding iron,
Fe-Cr and Fe-V alloys.
Most of the previous studies on Fe-Al alloys were focused on thin specimens (approx. 100 µm thick), mainly to study the AlN precipitation kinetics [4, 5, 6].
Such morphology of (γ) iron nitride has not been observed for nitrided iron, Fe-Cr and Fe-V alloys [10].
Mittemeijer: International Journal of Materials Research 99 (2008) 808 [8] E.J.
Mittemeijer: Journal of Heat Treatment and Materials 3 (2008) 139 [11] E.
Most of the previous studies on Fe-Al alloys were focused on thin specimens (approx. 100 µm thick), mainly to study the AlN precipitation kinetics [4, 5, 6].
Such morphology of (γ) iron nitride has not been observed for nitrided iron, Fe-Cr and Fe-V alloys [10].
Mittemeijer: International Journal of Materials Research 99 (2008) 808 [8] E.J.
Mittemeijer: Journal of Heat Treatment and Materials 3 (2008) 139 [11] E.
Online since: November 2012
Authors: Péter Barkóczy, Mihály Vlaszák, Katalin T. Takács, László Marosi, Kinga Kállai
Our company started an alloy development project with the aim of developing an alloy to miniature casting, which meets customer requirements the most.
The first group contains lead-free alloys or alloys with a low lead content (1-3 alloys).
The third group contained compounds with the lowest melting temperatures.
Hawkes, Journal of Power Sources, Vol. 67, pp. 213-218 (1997) [3] J.
Ishida, 1164 Ohnuma, Liu, Ohtani, and Ishida, Journal of ELECTRONIC MATERIALS, Vol. 28, No. 11, pp. 1164-1171 (1999) [8] S.W.
The first group contains lead-free alloys or alloys with a low lead content (1-3 alloys).
The third group contained compounds with the lowest melting temperatures.
Hawkes, Journal of Power Sources, Vol. 67, pp. 213-218 (1997) [3] J.
Ishida, 1164 Ohnuma, Liu, Ohtani, and Ishida, Journal of ELECTRONIC MATERIALS, Vol. 28, No. 11, pp. 1164-1171 (1999) [8] S.W.
Online since: October 2010
Authors: Jing Chao Zhang, X.Y Lu, Hua Chen
Oxidation Behavior of TiAl Based Alloys Prepared
by Spark Plasma Sintering
Hua Chen 1, a, Jingchao Zhang1,b and X.
The aim of this work is to investigate the influence of SPS microstructure of Ti-45Al-0.2Si-5Nb alloy on high temperature oxidation behavior.
However, for milled powder, since fine intermetallic compounds are formed in mechanical alloying, the bond and diffusion of particles mainly occurs between intermetallic compounds, thus granule microstructure is formed.
Huang,Y.H, He: Chinese Journal of Nonferrous Metals.
[10] H .Chen,Rare metal materials and Engineering:Vol.36(2007),p.1173 [11]V.S.Vladimir,Y.Z.Theodore,V.A.Igor:Mater Sci and Eng:Vol.343(2003),p.43 [12]M.Bououdina,Z.X.Guo:Mater Sci and Eng A:Vol 332(2002),p.210 [13]H.Hideki,A.Masatake,K.Toshiro et al: Journal of Alloys and Compounds:Vol 439(2007), p.221 [14] M.Yoshihara, Y-W.Kim:Intermetallics Vol 13(2005), p.952 [15] H.L.
The aim of this work is to investigate the influence of SPS microstructure of Ti-45Al-0.2Si-5Nb alloy on high temperature oxidation behavior.
However, for milled powder, since fine intermetallic compounds are formed in mechanical alloying, the bond and diffusion of particles mainly occurs between intermetallic compounds, thus granule microstructure is formed.
Huang,Y.H, He: Chinese Journal of Nonferrous Metals.
[10] H .Chen,Rare metal materials and Engineering:Vol.36(2007),p.1173 [11]V.S.Vladimir,Y.Z.Theodore,V.A.Igor:Mater Sci and Eng:Vol.343(2003),p.43 [12]M.Bououdina,Z.X.Guo:Mater Sci and Eng A:Vol 332(2002),p.210 [13]H.Hideki,A.Masatake,K.Toshiro et al: Journal of Alloys and Compounds:Vol 439(2007), p.221 [14] M.Yoshihara, Y-W.Kim:Intermetallics Vol 13(2005), p.952 [15] H.L.
Online since: June 2011
Authors: Rui Jorge C. Silva, Francisco Manuel Braz Fernandes, Corneliu Craciunescu, Karimbi K. Mahesh
Introduction
The novel ferromagnetic functionality of shape memory alloys has been of particular interest, especially for alloys belonging to the Heusler-type systems [1] along with the Fe-Pd [2] and Fe-Pt [3] systems.
Liu et al [10] studied intensively the microstructure evolution of CoNiGa shape memory alloys, showing that the composition affects morphology, with the volume fraction of γ phase decreasing gradually as Ga content increases, for high-temperature quenched or as-cast alloys.
In shape memory alloys, the severe plastic deformation has been experimented in several versions, among which the high Pressure Torsion (HPT) has been tested on NiTi alloys [12.13].
Zheng, Jianguo Li Journal of Alloys and Compounds Volume 420, Issues 1-2, 31 (2006)145-157
Li, Journal of Alloys and Compounds 417 (2006) 96–99 [12] V.G.
Liu et al [10] studied intensively the microstructure evolution of CoNiGa shape memory alloys, showing that the composition affects morphology, with the volume fraction of γ phase decreasing gradually as Ga content increases, for high-temperature quenched or as-cast alloys.
In shape memory alloys, the severe plastic deformation has been experimented in several versions, among which the high Pressure Torsion (HPT) has been tested on NiTi alloys [12.13].
Zheng, Jianguo Li Journal of Alloys and Compounds Volume 420, Issues 1-2, 31 (2006)145-157
Li, Journal of Alloys and Compounds 417 (2006) 96–99 [12] V.G.
Online since: January 2010
Authors: Ming Shao, Zhang Yi Xiao, Chao Yang, Yuan Yuan Li, Xiaoqiang Li
It is affirmed that mechanical milling weakens the thermostability of WC-8Co-2Al powders,
and facilitates the formation of Co-Al intermetallic compounds.
The aim of adding aluminum to WC-Co hardmetals is to save cobalt resource, inhibit WC grain growth and improve service performance by in situ forming intermetallic compounds from Co and Al phases during sintering.
Some research proved that Al could utterly react with Co to form intermetallic compounds when the mass ratio of Co to Al was 4:1 [7, 8].
The WC grains of sintered alloys of unmilling are about 515 nm, and the grains for 55 h milling dramatically go down to around 126 nm.
The formation of Al-Co compounds can be accelerated, mainly owing to refinement of reactants and elemental diffusion in each other caused by milling.
The aim of adding aluminum to WC-Co hardmetals is to save cobalt resource, inhibit WC grain growth and improve service performance by in situ forming intermetallic compounds from Co and Al phases during sintering.
Some research proved that Al could utterly react with Co to form intermetallic compounds when the mass ratio of Co to Al was 4:1 [7, 8].
The WC grains of sintered alloys of unmilling are about 515 nm, and the grains for 55 h milling dramatically go down to around 126 nm.
The formation of Al-Co compounds can be accelerated, mainly owing to refinement of reactants and elemental diffusion in each other caused by milling.
Online since: August 2022
Authors: Harsh Dave, Kaustubh Samvatsar
Several materials are used that are exposed to various chemistries of compounds [9, 2].
These compounds are removed in the form of slag.
It transforms solid alumina spinel (if present) to liquid state, thereby removal of undesirable compounds is possible in the form of slag.
· The flux reacts with the volatile gases and forms compounds by combining with the pre-existing Ca within the alloy, thereby removing the unwanted calcium from the cast alloy in the form of slag
Pai, Investigation on mechanical properties and creep behavior of stir cast AZ91-SiCp composites, Journal of Magnesium and Alloys 3 (2015) 16-22
These compounds are removed in the form of slag.
It transforms solid alumina spinel (if present) to liquid state, thereby removal of undesirable compounds is possible in the form of slag.
· The flux reacts with the volatile gases and forms compounds by combining with the pre-existing Ca within the alloy, thereby removing the unwanted calcium from the cast alloy in the form of slag
Pai, Investigation on mechanical properties and creep behavior of stir cast AZ91-SiCp composites, Journal of Magnesium and Alloys 3 (2015) 16-22
Online since: November 2018
The aim
is to determine jump-frequencies and their systematics.
Heusler NiMnGa alloys are often categorized as ferromagnetic shape memory alloys or magnetocaloric materials.
The results demonstrate the capability of using diffusion couples to speed up the discovery of new NiMnGa alloys or other alloys showing martensitic transformation.
He studied diffusion in metals, in intermetallic compounds, in semiconductors, in solar grade silicon, diffusion and electrolytic conduction in polymer electrolytes, and diffusion in minerals.
He got his Habilitation at the University of Kiel in 2001 and in Münster in 2005 with his research on 'Diffusion Behaviour and Electrical Properties of Point Defects in Semiconducting Elements, Alloys, and Compounds'.
Heusler NiMnGa alloys are often categorized as ferromagnetic shape memory alloys or magnetocaloric materials.
The results demonstrate the capability of using diffusion couples to speed up the discovery of new NiMnGa alloys or other alloys showing martensitic transformation.
He studied diffusion in metals, in intermetallic compounds, in semiconductors, in solar grade silicon, diffusion and electrolytic conduction in polymer electrolytes, and diffusion in minerals.
He got his Habilitation at the University of Kiel in 2001 and in Münster in 2005 with his research on 'Diffusion Behaviour and Electrical Properties of Point Defects in Semiconducting Elements, Alloys, and Compounds'.
Online since: June 2011
Authors: Roberto Martínez-Sánchez, Ivanovich Estrada-Guel, J. Martin Herrera-Ramírez, Mario Miki-Yoshida, J. I. Barajas-Villaruel, R. Pérez-Bustamante, F. Pérez-Bustamante, Patricia Amézaga-Madrid
Introduction
Aluminum alloys have wide applications in the aerospace industry due to their high strength/density ratios.
Comparison in hardness values between Al2044-CNTs composites and some commercial aluminum alloys* [8].
Additional studies must be done with the aim of confirm these mechanisms.
Martínez-Sánchez, Journal of Alloys and Compounds 483, (2009).p. 355–358 [2] H.
Martínez-Sánchez, Journal of Alloys and Compounds Vol. 450 (2008), p. 323
Comparison in hardness values between Al2044-CNTs composites and some commercial aluminum alloys* [8].
Additional studies must be done with the aim of confirm these mechanisms.
Martínez-Sánchez, Journal of Alloys and Compounds 483, (2009).p. 355–358 [2] H.
Martínez-Sánchez, Journal of Alloys and Compounds Vol. 450 (2008), p. 323