Depth-sensing time-dependent response of additively manufactured Ti-6Al-4V alloy

Muhammad, Muztahid; Masoomi, Mohammad; Torries, Brian; Shamsaei, Nima; Haghshenas, M.

doi:10.1016/j.addma.2018.09.008

Cited by 14 publications

(12 citation statements)

References 51 publications

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“…There are some real physical phenomena behind this trend. The observed increase in the indentation stress at shallower indentation depths is attributed to dislocation starvation and strain gradient plasticity [23,[31][32][33][34][35][36][37][38][39][40][41][42]. At the earliest stages of the nanoindentation when indenter's tip contacts the surface of the material with a depth of indentation only a few nanometers, the material can be considered dislocation-free (so-called dislocation starved) as there is no physical room for dislocations to be generated.…”

Section: Depth-dependent Indentation Stressmentioning

confidence: 99%

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Alghamdi

Haghshenas

2019

SN Appl. Sci.

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Additive manufacturing of aluminum alloys is considered a promising layer-wise manufacturing method which can produce lightweight critical automotive/aerospace/military components with enhanced physical and mechanical properties. This paper aims at assessing the correlation between microstructure and small-scale characteristics of an additive manufactured AlSi10Mg alloy in the as-printed and heat treated conditions. Depth-sensing nanoindentation testing, as a non-destructive, robust, and convenient testing approach, along with microstructural assessments, using optical microscopy and scanning electron microscopy, were employed to compare the nano-hardness of the printed (selective laser melting method) and the heat treated (age-hardening) materials. Considering the distance from the build plate, a gradation in the cooling rate, and therefore the microstructure, is expected which directly affect the nano-hardness gradient along the deposition direction. Results show a transition in the microstructure from cellular grains, with corallike silicon fiber colonies, to fragmented/spheroidized eutectic silicon particles upon the heat treatment. Unlike conventionally manufactured AlSi10Mg alloys, upon aging heat treatment in the additive manufactured AlSi10Mg alloy, the nano-hardness is decreased which is mainly contributed to stress relief, elimination of solid solution strengthening, and silicon spheroidization phenomena. These are considered in detail in the current paper.

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Section: Depth-dependent Indentation Stressmentioning

confidence: 99%

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Alghamdi

Haghshenas

2019

SN Appl. Sci.

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“…It is also necessary to express indentation stress appropriately for a Berkovich pyramidal indenter tip [25]:…”

Section: Steady-state Creep Theory For Nanoindentationmentioning

confidence: 99%

Indentation-based characterization of creep and hardness behavior of magnesium carbon nanotube nanocomposites at room temperature

Thornby

Verma²,

Mullis

et al. 2019

SN Appl. Sci.

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The time-dependent plastic deformation response of magnesium/carbon nanotube (CNT) nanocomposites containing 0.25, 0.5, and 0.75 vol% of carbon nanotubes is investigated through depth nanoindentation tests against monolithic pure magnesium in the present study. The Mg-CNT nanocomposite materials were successfully synthesized via a powder metallurgy technique coupled with microwave sintering followed by hot extrusion to produce 8-mm diameter, long solid bars. All depth-sensing indentation creep tests were conducted at ambient (room) temperature employing a diamond Berkovich pyramidal indenter. These tests are dual-stage, i.e., loading to a prescribed peak load of 50 mN, holding the peak load constant for a dwell period of 500 s, and finally unloading. Various strain rates of 0.01, 0.1, 1, and 10 s −1 were performed to assess the effects of strain rate and dwell time on the ambient temperature creep response of the Mg-CNT nanocomposites. The outcomes of these tests are explained through material hardness, microstructure, the extent of CNT content in each material, and strain rate sensitivity. Upon analyzing the nanoindentation creep tests, the dominant creep mechanism at room temperature was found to be a dislocation creep mechanism. It is also found that CNTs increase the creep resistance of magnesium. Findings of this study can be used as a starting point for a high-temperature creep study on Mg-CNT nanocomposites. This paper is a continued study from our group on time-dependent plastic deformation of Mg nanocomposites (i.e., see Haghshenas et al., Journal of Composite Materials,

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“…Titanium and titanium alloys are widely used in aerospace, automotive and medical applications due to their many advantages, such as a high strength-to-weight ratio, good electrochemical corrosion resistance, low density, relatively low modulus of elasticity and biological inertness [1][2][3]. Among titanium alloys, the two-phase (α + β) Ti-6Al-4V alloy is used in more than half of the commercial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Among titanium alloys, the two-phase (α + β) Ti-6Al-4V alloy is used in more than half of the commercial applications. This alloy exhibits a good balance of strength and plastic properties and it is also the most investigated titanium alloy [2,4]. However, the tribological applications of this alloy are limited because of its high coefficient of friction (COF) and poor wear resistance [3,5].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Electrophoretic Deposition Parameters and Heat Treatment on the Microstructure and Tribological Properties of Nanocomposite Si3N4/PEEK 708 Coatings on Titanium Alloy

et al. 2019

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Nanocomposite Si3N4/PEEK 708 coatings were successfully fabricated on the Ti-6Al-4V alloy substrate by electrophoretic deposition (EPD) and post-EPD heat treatment. The addition of chitosan polyelectrolyte into ethanolic-based suspensions enabled the cathodic co-deposition of ceramic and polymeric particles. Zeta potential measurements allowed the elaboration of stable suspensions. The selection of the optimal EPD voltage and time enabled uniform coatings to be obtained. Heating above the PEEK melting point and cooling with a furnace or in water resulted in the formation of dense coatings with semi-crystalline or amorphous polymer structures, respectively. Both coatings with a thickness in the range of 90–105 µm had good adhesion and scratch resistance to the substrates, despite the presence of relatively high degrees of open porosity. The coatings improved the tribological properties of the titanium alloy. However, a strong relationship between the polymeric matrix structure and wear resistance was observed. Semi-crystalline coatings proved to be significantly more wear resistant than amorphous ones.

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Depth-sensing time-dependent response of additively manufactured Ti-6Al-4V alloy

Cited by 14 publications

References 51 publications

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Microstructural and small-scale characterization of additive manufactured AlSi10Mg alloy

Indentation-based characterization of creep and hardness behavior of magnesium carbon nanotube nanocomposites at room temperature

The Influence of Electrophoretic Deposition Parameters and Heat Treatment on the Microstructure and Tribological Properties of Nanocomposite Si3N4/PEEK 708 Coatings on Titanium Alloy

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