Investigation on NiAl–TiC–Al2O3 composite prepared by self-propagation high temperature synthesis with hot extrusion

Sheng, Li Yuan; Yang, Fang; Jianting, Guo; Xi, Tao; Ye, H.Q.

doi:10.1016/j.compositesb.2012.05.038

Cited by 72 publications

(25 citation statements)

References 34 publications

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“…Because the formation of Cr 2 Nb phase is related to the element segregation, the change of solidification mode could help to eliminate this kind of phase. In addition, it is still found that there are some metastable (Nb,Ti) 3 Si phases along the eutectic cell boundaries, as shown in Fig.1 SEM observations on the microstructure of the Nb-Ti-Si-Cr-Al-Hf-Dy alloy DS at different growth rate are exhibited in Fig.2. Clearly, the DS process has changed the microstructure of the alloy greatly.…”

Section: Resultsmentioning

confidence: 94%

“…TEM analyses were carried out on the JEOL-2100 high-resolution transmission electron microscope (HRTEM). Compression sample (4×4×6 mm 3 ) was cut from the AC and DS alloys and mechanical grounded by 800-grit SiC abrasive. Gleeble 3800 was employed to carry out the compression test at strain rate of 2×10 -3 /s.…”

Section: Methodsmentioning

confidence: 99%

“…Intermetallic compounds have been paid much attention recently, due to their excellent properties in some aspects [1][2][3]. 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].…”

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: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Moreover, the Mg 3 Zn 2 Y 3 strengthening phases are fragmented into small ones and semi-continuously distributed along the extrusion direction as the strip shape. The cooperation of fragmented strengthening phase and extrusion promotes the refinement of the microstructure further [34][35][36]. The observation on the cross section of the hot extruded alloy exhibits that the Mg 3 Zn 2 Y 3 strengthening phases mainly distribute along the grain boundary and form the semi-continuous annular shape, as shown in figure 4 (b).…”

Section: Resultsmentioning

confidence: 99%

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

Sheng

Wang

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In the present paper, the Mg-Zn-Y-Nd alloy was prepared by casting, heat treatment and hot extrusion. The microstructure and mechanical properties of the alloys were tested by OM, SEM, TEM and tensile test. The results showed that the Mg 3 Zn 2 Y 3 phase is the main strengthening phase and forms the eutectic structure with α-Mg matrix in the as cast alloy. The strengthening phases semi-continuously connect and separate the α-Mg matrix into cell structure. The average grain size of the as cast alloy is about 60 μm. The heat treatment promotes the solid solution of the strengthening phase and precipitation of small particles inside grain.Compared with the as cast alloy, the heat treatment increases grain size a little and mechanical properties more than 30%. The hot extrusion refines the grain and strengthening phase, which increase the mechanical properties significantly. Moreover, the great deformation by the hot extrusion results in the ultrafine structure and abundant of crystal defects. The intersection of micro-twins lead to the special region with nanometer size. IntroductionMagnesium (Mg) alloys have attracted great attention as the light weight structural materials owing to their high specific strength, low density, ease of recycling and good damping, which can be applied in many fields, including implants, hand tools, sports equipment, automobiles, aerospace applications and electronic equipment [1][2][3][4]. Moreover, the recent research exhibited that the clinic trial of coronary stent made by rare earth doped Mg alloy exhibited good therapeutic effect without thrombosis, which demonstrated the good application prospect of Mg based implant [5]. However, the hexagonal closepacked (HCP) crystal structure of Mg limited the number of initiation slip systems during deformation at relative low temperature, which resulted in the poor deformability of Mg alloy [6]. The poor ductility and low strength of Mg alloy handicapped its wide application. To conquer these shortcomings of Mg alloy, many methods had been applied [7][8][9]. Alloying and thermal processing had been thought as the efficient method to improve the mechanical properties of Mg alloy at room and high temperature.Recently, the investigations [10-12] on biomedical magnesium alloys revealed that the addition of Zn could improve its mechanical properties and corrosion resistance with little influence on its biocompatibility, because the Zn is the essential element of the human body. Then a series of new magnesium alloys for biomedical application were developed [13][14][15]. The research of Zhang et al. [10] exhibited that Zn addition in Mg could increases the mechanical performance and biocompatibility, and the Mg-6Zn (wt.%) alloy was the best choice. But the mechanical properties of Mg-Zn alloy is not

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Effect of extrusion temperature on the microstructure and tensile property of 2D-Cf/Al composites by liquid extrusion infiltration

2017

Int J Adv Manuf Technol

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Investigation on NiAl–TiC–Al2O3 composite prepared by self-propagation high temperature synthesis with hot extrusion

Cited by 72 publications

References 34 publications

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

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

Influence of heat treatment and hot extrusion on the microstructure and tensile properties of rare earth modified Mg-Zn based alloy

Effect of extrusion temperature on the microstructure and tensile property of 2D-Cf/Al composites by liquid extrusion infiltration

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