Deformation and fracture behavior of Nb in Nb5Si3/Nb laminates and its effect on laminate toughness

Kajuch, J.; Short, John; Lewandowski, John J.

doi:10.1016/0956-7151(94)00391-t

Cited by 91 publications

(68 citation statements)

References 21 publications

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“…Moreover, the microstructure shows coarse Į-(Nb,Ti) 5 Si 3 dendrite. The black (Ti,Nb) 5 Si 3 phases prefer to precipitate along the eutectic cell boundary and form the semi-continuously necklace shape. White particles prefer to precipitate along phase and grain boundary, but its distribution is random.…”

Section: Resultsmentioning

confidence: 99%

“…The (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 phases form the eutectic structure with the embellishment with of black (Ti,Nb) 5 Si 3 phase and some white particles. Moreover, the microstructure shows coarse Į-(Nb,Ti) 5 Si 3 dendrite. The black (Ti,Nb) 5 Si 3 phases prefer to precipitate along the eutectic cell boundary and form the semi-continuously necklace shape.…”

Section: Resultsmentioning

confidence: 99%

“…According to recent research [8], the gray-white matrix should be (Nb,Ti)ss phase and gray phase should be Į-(Nb,Ti) 5 Si 3 . The (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 phases form the eutectic structure with the embellishment with of black (Ti,Nb) 5 Si 3 phase and some white particles. Moreover, the microstructure shows coarse Į-(Nb,Ti) 5 Si 3 dendrite.…”

Section: Resultsmentioning

confidence: 99%

“…As one type of high-temperature intermetallic compound, niobium silicide possesses many superiorities, such as excellent high-temperature creep strength and high melting point (about 2793 K) [4,5]. Therefore, the niobium silicide has been thought as a potential material to apply in super high-temperature environment.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the relative low high-temperature strength of Nbss, the massive presence of Nbss would be detrimental to the high-temperature property. Then, to take full use of the strength of Nb 5 Si 3 and ductility of Nbss, the Nbss and Nb 5 Si 3 phases should be arranged as an alternative lamellar structure. Moreover the precipitation of NbCr 2 Laves phase is also detrimental to the fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Sheng

2016

MATEC Web Conf.

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Abstract. The Nb-Ti-Si-Cr-Al-Hf-Dy alloy was prepared by conventionally casting and then directionally solidified (DS) with the optical floating zone melting technology. Microstructural evolution and mechanical properties of the as cast (AC) and DS alloys were studied by XRD, SEM, TEM, compression and bending tests. The results exhibit that Į-(Nb,Ti) 5 Si 3 , (Ti,Nb) 5 Si 3 and (Nb,Ti)ss phases formed the microstructure of the AC alloy, with precipitates of Cr 2 Nb, Dy 2 O 3 and (Nb,Ti) 3 Si along phase or grain boundaries. The DS alignes (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 lamellae parallel to the growth direction and refines the eutectic cell, but coarsens the primary Į-(Nb,Ti) 5 Si 3 phase. The DS alloy exhibits strong orientation of (310) (Nb,Ti)5Si3 and (110) (Nb,Ti)ss along the growth direction. TEM observation reveals that (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 phases have an orientation relationship of [110] (Nb,Ti)ss // [310] Į-(Nb,Ti)5Si3 and (002) (Nb,Ti)ss // (002) Į-(Nb,Ti)5Si3 . Compared with the AC alloy, the DS increases the mechanical properties of the alloy obviously and the alloy DS at 8 mm/h exhibits the best mechanical properties.

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Section: Resultsmentioning

confidence: 99%