Effects of Forming Conditions and TiC-TiB2 Contents on the Microstructures of Self-Propagating High-Temperature Synthesized NiAl-TiC-TiB2 Composites

doi:10.1007/s40195-014-0163-y

Abstract

Abstract:

The NiAl-TiC-TiB₂ composites were processed by self-propagating high-temperature synthesis (SHS) method using raw powders of Ni, Al, Ti, B₄C, TiC, and TiB₂, and their microstructure and micro-hardness were investigated. The TiC-TiB₂ in NiAl matrix, with contents from 10 to 30 wt%, emerged with the use of two methods: in situ formed and externally added. The results show that all final products are composed of three phases of NiAl, TiC, and TiB₂. The microstructures of NiAl-TiC-TiB₂ composites with in situ-formed TiC and TiB₂ are fine, and all the three phases are distributed uniformly. The grains of NiAl matrix in the composites have been greatly refined, and the micro-hardness of NiAl increases from 381 HV₁₀₀ to 779 HV₁₀₀. However, the microstructures of NiAl-TiC-TiB₂ composites with externally added TiC and TiB₂ are coarse and inhomogeneous, with severe agglomeration of TiC and TiB₂ particles. The samples containing externally added 30 wt% TiC-TiB₂ attain the micro-hardness of 485 HV₁₀₀. The microstructure evolution and fracture mode of the two kinds of NiAl-TiC-TiB₂ composites are different.

Key words: NiAl-TiC-TiB2 composite, Self-propagating high-temperature synthesis (SHS), Forming condition TiC-TiB2 content, Microstructure

Na Wei, Hong-Zhi Cui, Jie Wu, Jun Wang, Guan-Long Wang, Chen Jiang. Effects of Forming Conditions and TiC-TiB₂ Contents on the Microstructures of Self-Propagating High-Temperature Synthesized NiAl-TiC-TiB₂ Composites[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(1): 39-47.

Figures/Tables 12

Fig. 1 SEM images showing the morphologies of raw materials of Ni a, Al b, Ti c, B4C d, TiB2 e, TiC f

Table 1 The molar proportions of starting materials and their symbols

Scheme	Sample	Number
Pure NiAl	Ni + Al	0
A	Ni + Al + 10 wt%(3Ti + B₄C)	A-10
	Ni + Al + 20 wt%(3Ti + B₄C)	A-20
	Ni + Al + 30 wt%(3Ti + B₄C)	A-30
B	Ni + Al + 10 wt%(TiC + 2TiB₂)	B-10
	Ni + Al + 20 wt%(TiC + 2TiB₂)	B-20
	Ni + Al + 30 wt%(TiC + 2TiB₂)	B-30

Fig. 2 Schematic diagram of SHS reaction initiated by electrifying tungsten wire

Fig. 3 X-ray diffraction spectra of products: a Ni + Al + x(3Ti + B4C), b Ni + Al + x(TiC + 2TiB2)

Fig. 4 SEM images showing the microstructures of in situ formed NiAl-TiC-TiB2 composites with different contents of (3Ti + B4C): a O, b A-10, c A-20, d A-30

Fig. 5 Microstructure a, fracture graph b, observed by SEM, and EDS spectra detected on TiB2 and TiC phases in the NiAl-TiC-TiB2 composites with 30 wt% (3Ti + B4C)

Fig. 6 SEM images showing the microstructures of NiAl-TiC-TiB2 composites with different contents of (TiC + 2TiB2): a B-10, b B-20, c B-30

Fig. 7 Average micro-hardness values measured on NiAl matrix of the NiAl-TiC-TiB2 composites: a Ni + Al + x(3Ti + B4C), b Ni + Al + x(TiC + 2TiB2)

Fig. 8 SEM fractographs of simple NiAl a, Ni + Al + 20%(3Ti + B4C) b, Ni + Al + 20%(TiC + 2TiB2) c composites

Fig. 9 Schematic drawing illustrates the formation of microstructure in Ni-Al-3Ti-B4C system

Fig. 10 Schematic drawing illustrates the formation of microstructure in Ni-Al-2TiB2-TiC system

Fig. 11 SEM images showing the microstructures of NiAl-TiC-TiB2 composites with different contents of (TiC + 2TiB2): a B-10, b B-20

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Effects of Forming Conditions and TiC-TiB₂ Contents on the Microstructures of Self-Propagating High-Temperature Synthesized NiAl-TiC-TiB₂ Composites

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