The Role of Refractory Metals in the Development of Structural Intermetallic Compounds

2001 ◽  
Vol 22 (2) ◽  
pp. 615-631
Author(s):  
R.V. RAMANUJAN
Author(s):  
Makoto Nanko ◽  
Akio Takahashi ◽  
Takashi Ogura ◽  
Akihiko Kitahara ◽  
Katsuyuki Yanagihara ◽  
...  

2007 ◽  
Vol 560 ◽  
pp. 97-102 ◽  
Author(s):  
Felipe García ◽  
Armando Salinas-Rodríguez ◽  
Enrique Nava-Vázquez

The reaction between solid steel and liquid Al-Zn-Si alloy leads to the formation of a solid intermetallic interfacial layer. In the case of industrial Al-43.5Zn-1.5Si coated steel strips, the thickness of the intermetallic layer is on average 1.35 μm and the kinetics of the reaction is controlled by the effect of Si on Al and Fe diffusivities through the solid intermetallic layer. In this paper it is shown that the thickness of the intermetallic interfacial layer decreases as the Si content in the liquid alloy increases. EDXS microanalysis at the interface of industrial coated steel strips shows that the interfacial intermetallic compounds are chemically similar to those formed in the bulk of Al-43.5Zn-1.5Si liquid baths in continuous coating lines. Differential acid dissolution of the coatings reveals that the intermetallic layer is not planar at the interface with the coating overlay and is formed by grains of different size and chemical composition. Addition of minute quantities of Ti to the Al-Zn-Si liquid alloy causes changes in the morphology of the intermetallic layer and an overall refining of the microstructure.


1988 ◽  
Vol 3 (3) ◽  
pp. 426-440 ◽  
Author(s):  
Osamu Izumi ◽  
Takayuki Takasugi

The present article first describes some characteristics of structure, chemistry, and electronic (bond) nature for grain boundaries in the A3B Li2-type intermetallic compounds. Next, the phenomenological aspects for the grain boundary brittleness of the Li2-type intermetallic compounds are reviewed with respect to the combination of the constituent atoms, the alloying effect, the stoichiometry effect, and a role of impurity or gaseous atoms. It is emphasized that the brittleness of grain boundaries in the intermetallic compounds is directly controlled by the atomistic and electronic structures at grain boundary regions. Based on these systematic investigations, it is suggested that the brittleness of the Li2-type intermetallic compounds can be manipulated by appropriate control of composition and the corresponding electrochemical bond environment at grain boundary planes and by control of test environment. Furthermore, some examples of the materials development are described.


2006 ◽  
Vol 89 (20) ◽  
pp. 201909 ◽  
Author(s):  
I. Jacob ◽  
M. Bereznitsky ◽  
O. Yeheskel ◽  
R. G. Leisure

MRS Bulletin ◽  
1993 ◽  
Vol 18 (2) ◽  
pp. 44-49 ◽  
Author(s):  
J.H. Westbrook

History is replete with examples of the enormous impact of data compilations in all fields of science and technology. The advantages and opportunities such aggregations confer include:• convenience of access,• condensation and homogenization of raw data,• formats tailored for the application,• perception of patterns,• detection of errors,• definition of gaps and inconsistencies, and• basis for formulating and testing theories.The opportunities in materials science, and specifically in the subfield of alloy design, are no fewer than in other fields of science. Indeed, as I have remarked in a review of the history of the development of understanding and application of intermetallic compounds, breakthroughs in this field have usually come about not from “a new technique, a unique experimental observation, or an abstruse theory… Rather it was the amassing of a critical volume of experimental data in the literature which permitted an individual with great insight to perceive an underlying pattern not previously apparent.”


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