Synthesis of Metal Matrix Composites Based on CrxNiy-TiN for Additive Technology

The novelty of this work consists of obtaining original fundamental data on the laws of synthesis of new metal matrix composite materials for additive technologies. CrN + TiNi composites were obtained using the method of self-propagating high-temperature synthesis. In this work, analysis of the parameters of the synthesis of composite materials as well as their structure and phase composition were carried out. A scheme for the formation of a composite structure is established; it is shown that the phase composition is represented by 54.6 wt.% CrN and 45.4 wt.% TiNi. It was shown that composites based on the system are suitable for machines that make use of direct laser deposition to grow layers of materials. Sample structure and phase parameters were studied. It is shown that titanium nitride particles are uniformly distributed in the CrNi intermetallic matrix, the TiN particle size ranges from 0.3 to 9 μm and the average particle size is 2.8 μm. The results obtained indicate the possibility of synthesizing promising metal matrix composite materials for additive technologies. Such materials may have increased hardness, operating temperature and strength.

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High-Temperature Synthesis of Metal–Matrix Composites (Ni-Ti)-TiB2

Applied Sciences ◽

10.3390/app11052426 ◽

2021 ◽

Vol 11 (5) ◽

pp. 2426

Author(s):

Vladimir Promakhov ◽

Alexey Matveev ◽

Nikita Schulz ◽

Mikhail Grigoriev ◽

Andrey Olisov ◽

...

Keyword(s):

High Temperature ◽

Composite Materials ◽

Metal Matrix Composite ◽

Matrix Composite ◽

Metal Matrix ◽

Average Particle Size ◽

Synthesis Process ◽

Average Particle ◽

Temperature Synthesis ◽

High Temperature Synthesis

Currently, metal–matrix composite materials are some of the most promising types of materials, and they combine the advantages of a metal matrix and reinforcing particles/fibres. Within the framework of this article, the high-temperature synthesis of metal–matrix composite materials based on the (Ni-Ti)-TiB2 system was studied. The selected approaches make it possible to obtain composite materials of various compositions without contamination and with a high degree of energy efficiency during production processes. Combustion processes in the samples of a 63.5 wt.% NiB + 36.5 wt.% Ti mixture and the phase composition and structure of the synthesis products were researched. It has been established that the synthesis process in the samples proceeds via the spin combustion mechanism. It has been shown that self-propagating high-temperature synthesis (SHS) powder particles have a composite structure and consist of a Ni-Ti matrix and TiB2 reinforcement inclusions that are uniformly distributed inside it. The inclusion size lies in the range between 0.1 and 4 µm, and the average particle size is 0.57 µm. The obtained metal-matrix composite materials can be used in additive manufacturing technologies as ligatures for heat-resistant alloys, as well as for the synthesis of composites using traditional methods of powder metallurgy.

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Effect of Pr Modification Treatment on the Microstructure and Mechanical Properties of Cast Al-Mg2Si Metal Matrix Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.936.23 ◽

2014 ◽

Vol 936 ◽

pp. 23-27 ◽

Cited By ~ 3

Author(s):

Yi Si

Keyword(s):

Tensile Strength ◽

Metal Matrix Composite ◽

Matrix Composite ◽

Metal Matrix ◽

Average Particle Size ◽

Tensile Tests ◽

Average Particle ◽

Polyhedral Shape ◽

Strength And Ductility

The effect of different concentrations of Pr on the microstructure and tensile properties of cast Al-18 wt.%Mg2Si in situ metal matrix composite was investigated. The results show that the addition of proper amount of Pr has significant modification effect on primary Mg2Si in the Al-18 wt.% Mg2Si composite. With the increase of Pr content from 0.1 to 0.7%, the morphology of primary Mg2Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased from 65 to 17 μm. When the Pr content exceeds 1.0%, the primary Mg2Si become coarse again. Tensile tests reveal that the Pr addition improves the tensile strength and ductility of the material. Comparing with those of unmodified composite, the ultimate tensile strength and percentage elongation with 0.7% Pr are increased by 36.5% and 161.6%, respectively.

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