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Dynamic Phase Transformation during Superplastic Deformation of Nb/Nb^sub 3^AI In-Situ Composite
Metallurgical and Materials Transactions; 2/1/2004; Murayama, Yonosuke; Wei, Fang; 787 words
; Nb^sub ss^/Nb^sub 3^Al in-situ composite with the nominal composition of Nb-16 mol pct Al-1 mol pct B, consisting of bcc niobium solid solution (Nb^sub ss^) and A15 ordered Nb^sub 3^Al, was synthesized by arc melting, homogenization annealing, and ...
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Transformation of Mechanically Alloyed Nb-Sn Powder to Nb^sub 3^Sn
Metallurgical and Materials Transactions; 9/1/2004; Patankar, S N; Froes, F H (Sam); 787 words
; Nb^sub 3^Sn was processed via mechanical alloying (MA). The powder mixture comprised of stoichiometric ... 3 hours and the mechanically alloyed powder mixture was heat treated. While MA resulted in Nb-Sn solid solution, the reaction leading to the formation of Nb^sub 3^Sn occurs during the subsequent heat ...
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The Possible Application of Nb-W-Cr Alloys in High-Temperature Air
JOM; 6/1/2007; Portillo, Benedict; Kakarlapudi, Purushotham; Varma, S K; 787 words
; Alloys from the Nb-W-Cr system have been investigated for possible application at temperatures above 1,000C. In this study, Nb-20W-5Cr (compositions are in weight percent) and Nb-20W-10Cr alloys were exposed to air for both 24 hours and ...
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Effects of Zr on the Eutectoid Decomposition Behavior of Nb^sub 3^Si into (Nb)/Nb^sub 5^Si^sub 3^
Metallurgical and Materials Transactions; 3/1/2005; Miura, Seiji; Aoki, Miki; Saeki, Yasuhiko; Ohkubo, Kenji; Et al; 787 words
; The effect of Zr on the formation of Nb/Nb^sub 5^Si^sub 3^ lamellar microstructure by eutectoid decomposition reaction of Nb^sub 3^Si is investigated. It has been shown that the kinetics of the eutectoid decomposition of high-temperature Nb^sub 3 ...
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Partial Phase Relationships in Ir-Nb-Ni-Al and Ir-Nb-Pt-Al Quaternary Systems and Mechanical Properties of Their Alloys
Metallurgical and Materials Transactions; 3/1/2005; Huang, C; Yamabe-Mitarai, Y; Yu, X H; Nakazawa, S; Harada, H; 787 words
; Two quaternary systems, Ir-Nb-Ni-Al and Ir-Nb-Pt-Al, were successively investigated to assess their possible ... primarily established, and the mechanical properties were studied. Ir-Nb-Ni-Al quaternary alloys around the Ir-rich or Ni-rich corners of ...
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Oxidation Behavior of Multiphase Nb-Mo-Si-B Intermetallics
Metallurgical and Materials Transactions; 3/1/2005; Liu, Y; Kramer, M J; Thom, A J; Akinc, M; 787 words
; The mixed substitution of Nb and Mo in the ternary systems Mo-Si-B and Nb-Si-B was studied with the goal of balancing oxidation ... microstructure and oxidation behavior of six compositions in the Nb-Mo-Si-B system were characterized using X-ray diffraction ...
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Nonisothermal and Isothermal Oxidation Behavior of Nb-Si-Mo Alloys
Metallurgical and Materials Transactions; 3/1/2008; Chattopadhyay, K; Mitra, R; Ray, K K; 787 words
; The nonisothermal and isothermal oxidation behavior of arc-melted, hypereutectic Nb-19Si-5Mo, Nb-18Si-26Mo, and hypoeutectic Nb-13Si-4Mo, and Nb-12Si-15Mo ternary alloys have been investigated vis--vis that of Nb and Nb-10Si alloy ...
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Chlorination Treatment to Improve the Oxidation Resistance of Nb-Mo-Si-B Alloys
Metallurgical and Materials Transactions; 3/1/2005; Behrani, Vikas; Thom, Andrew J; Kramer, Matthew J; Akinc, Mufit; 787 words
; Recent studies have shown that the quaternary Nb-Mo-Si-B system is not oxidation resistant ... oxidation resistance between Mo-Si-B and Nb-Mo-Si-B may be interpreted in terms of the ... leaving a porous borosilicate glassy scale. Nb^sub 2^O^sub 5^ persists as a rapidly growing ...
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Effects of Ti addition on cleavage fracture in Nb-Cr-Ti solid-solution alloys
Metallurgical and Materials Transactions; 4/1/1999; Chan, Kwai S; Davidson, David L; 787 words
; The fracture toughness of Nb-Cr-Ti solid-solution alloys has been shown ... experiments were performed on the tough Nb-Cr-Ti alloy to characterize the crack-tip ... performed as a function of Ti content in the Nb-Cr-Ti alloys. The experimental results indicate ...
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Toughness and Strength Characteristics of Nb-W-Si Ternary Alloys Prepared by Arc Melting
Metallurgical and Materials Transactions; 12/1/2003; Sha, Jiangbo; Hirai, Hisatoshi; Tabaru, Tatsuo; Kitahara, Akira; Et al; 787 words
; ... article describes the room-temperature and high-temperature mechanical properties and failure modes of series Nb-W-Si alloys-Nb-10W, Nb-10Si, Nb-10Si-5W, Nb-10W-5Si, and Nb-10W-10Si-prepared by arc melting. For the Nb-10W alloy, the microstructure ...
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