Effect of Nickel Addition on Microstructure and Mechanical Properties of the Spark Plasma Sintered Ti–6Al–4V Alloy

A. Muthuchamy, M. Rajadurai, A. Raja Annamalai, Dinesh Kumar Agrawal

Research output: Contribution to journalArticle

Abstract

The effect of nickel addition (2–6 wt%) to Ti–6Al–4V has been investigated using spark plasma sintering. The sintered samples were studied and characterized by using field emission scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction techniques. Mechanical properties of the sintered samples were determined. Results show that an increase in nickel addition significantly reduces the relative densities from 97.9 to 95.9% and the microhardness of the alloys increases from 330 to 502 HV500. The microstructural studies reveal a transformation; as Ni content increases, the equiaxed alpha phase and Widmanstatten alpha platelets in the Ti–6Al–4V alloy get refined and develop the clear grain boundaries with Widmanstatten lamellar microstructure. Sintered samples held for 30 min has the highest hardness value, while fracture morphology of the sintered compacts shows a transgranular fracture with fine dimple’s features, confirming good strength and cohesion of the grains. The percentage of elongation is greatly affected by the addition of nickel so that the sample exhibits a brittle nature with high ultimate tensile strength.

Original languageEnglish (US)
JournalTransactions of the Indian Institute of Metals
DOIs
StateAccepted/In press - Jan 1 2019

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Nickel
Electric sparks
Plasmas
Mechanical properties
Microstructure
Spark plasma sintering
Platelets
Field emission
Microhardness
Elongation
Grain boundaries
Tensile strength
Hardness
X ray diffraction
Scanning electron microscopy
titanium alloy (TiAl6V4)

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

Cite this

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abstract = "The effect of nickel addition (2–6 wt{\%}) to Ti–6Al–4V has been investigated using spark plasma sintering. The sintered samples were studied and characterized by using field emission scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and X-ray diffraction techniques. Mechanical properties of the sintered samples were determined. Results show that an increase in nickel addition significantly reduces the relative densities from 97.9 to 95.9{\%} and the microhardness of the alloys increases from 330 to 502 HV500. The microstructural studies reveal a transformation; as Ni content increases, the equiaxed alpha phase and Widmanstatten alpha platelets in the Ti–6Al–4V alloy get refined and develop the clear grain boundaries with Widmanstatten lamellar microstructure. Sintered samples held for 30 min has the highest hardness value, while fracture morphology of the sintered compacts shows a transgranular fracture with fine dimple’s features, confirming good strength and cohesion of the grains. The percentage of elongation is greatly affected by the addition of nickel so that the sample exhibits a brittle nature with high ultimate tensile strength.",
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Effect of Nickel Addition on Microstructure and Mechanical Properties of the Spark Plasma Sintered Ti–6Al–4V Alloy. / Muthuchamy, A.; Rajadurai, M.; Annamalai, A. Raja; Agrawal, Dinesh Kumar.

In: Transactions of the Indian Institute of Metals, 01.01.2019.

Research output: Contribution to journalArticle

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