2006
DOI: 10.1557/proc-980-0980-ii05-33
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Microstructure Control of Nb-Si Alloy Doped with Zr and Mg through Eutectic and Eutectoid Reactions and its Deformation Behavior

Abstract: In order to overcome the brittleness of Nb-Si intermetallic compounds, a novel microstructure control through a eutectic solidification and a eutectoid decomposition reactions has been proposed for obtaining Nb matrix alloys with Nb-silicide dispersion by the present authors. As the additions of Zr and Mg accelerate the eutectoid decomposition rate and spheroidization of Nb-silicide during heat treatment, the effects of these additives on the eutectic microstructure are investigated. The effect of the growth r… Show more

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Cited by 6 publications
(16 citation statements)
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“…Zr accelerates the eutectoid decomposition, and Mg accelerates the spheroidization of Nb 5 Si 3 ( Fig. 1) [7][8][9][10]. Although a similar microstructure was also reported by Kim extremely high temperature heat treatment of Nb-Mo-Si alloy, the alloys contain no Nb 3 Si phase and the principles of the microstructure evolution might be different.…”
Section: Introductionmentioning
confidence: 55%
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“…Zr accelerates the eutectoid decomposition, and Mg accelerates the spheroidization of Nb 5 Si 3 ( Fig. 1) [7][8][9][10]. Although a similar microstructure was also reported by Kim extremely high temperature heat treatment of Nb-Mo-Si alloy, the alloys contain no Nb 3 Si phase and the principles of the microstructure evolution might be different.…”
Section: Introductionmentioning
confidence: 55%
“…On the other hand, the authors have paid attention to combine a eutectic reaction at 2188 K (L − >Nb + Nb 3 Si) and a eutectoid reaction at 2043 K (Nb 3 Si − >Nb 5 Si 3 + Nb) to obtain a microstructure with a high-volume fraction of fine Nb 5 Si 3 dispersed in Nb grains through a sequence depicted in Fig. 1 [7][8][9]. Keys for the microstructure development are as follows.…”
Section: Introductionmentioning
confidence: 99%
“…However the application of such an alloy is limited by poor room temperature ductility and sudden drop in yield strength at high temperature [3,9]. In order to overcome the above problems, several alloying additions are attempted in the literature [10][11][12][13][14][15][16][17][18][19][20][21][22]. The additions of Mo, W, Cr, Al, Hf, Ge and Ga suppress the formation of Nb 3 Si and promote the formation of Nb ss /bNb 5 Si 3 eutectic composite.…”
Section: Introductionmentioning
confidence: 99%
“…However, the main obstacles for its development are its low fracture toughness and poor oxidation resistance [1,2]. In order to overcome these limitations, several alloying additions have been attempted [3][4][5][6][7][8][9][10][11][12][13][14][15]. These affect the crystal structure, melting temperature, phase distribution and microstructure.…”
Section: Introductionmentioning
confidence: 99%
“…But Hf suppress the formation of Nb 3 Si and promote the formation of Nb ss /bNb 5 Si 3 eutectic composite [7,10,12,13,14]. This class of elements decreases the density and increases the oxidation resistance.…”
Section: Introductionmentioning
confidence: 99%