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Effect of Indentation Size and Strain Rate on Nanomechanical Behavior of Ti-6Al-4VAlloy

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Abstract

Nanoindentation experiments were carried out at strain rates of 0.05, 0.10, 0.15 and 0.20/s at indentation depths of 1000, 1500 and 2000 nm to investigate the nanomechanical behaviour of Ti-6Al-4V alloy. The strain rate had little influence on nanohardness, however, nanohardness as well as Young’s modulus gradually decreased with the increase of indentation depth indicating strong indentation size effects. The relation between H2 and 1/h exhibited a good linear relationship, and it is observed that the effect of strain gradient on σ/σ0 is significant at high strain rates according to Nix and Gao strain gradient model. The analysis of plastic behaviour revealed that, strain rates had no significant effect on strain hardening exponent, but had little influence on yield stress.

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Abbreviations

A proj :

Projected Area.nm2

b :

Burgers vector, nm

C :

Loading curvature

D :

Damage Variable

E* :

Reduced Young’s modulus, GPa

E :

Specimen Young’s modulus from Nanoindentation GPa,

E u :

Young’s modulus of undamaged material, GPa

H :

Hardness, GPa

H 0 :

Nanoindentation hardness for a large indentation depth, GPa

h :

Indentation depth, nm

h* :

Characteristic length, nm

h c :

Indenter contact depth, nm

h m :

Max indentation depth, nm

h r :

Reduced indentation depth, nm

n :

Strain Hardening Exponent

P :

Indentation load, mN

P max :

Maximum indentation load, mN

S :

Slope of the unloading curve

\( \nu_{s} \) :

Poisson ratio of the specimen

\( \nu_{i} \) :

Poisson ratio of the indenter

σ :

Flow stress in the presence of a strain gradient, MPa

σ o :

Flow stress in the absence of strain gradient, MPa

σ y :

Yield stress, MPa

ρ s :

Density of statistically stored dislocations,

μ :

Shear modulus, GPa

θ :

Angle between the surface of the indenter and the plane of the specimen surface

\( \chi \) :

Strain gradient

l ^ :

Intrinsic material length scale, µm

ε :

Strain

ε p :

Plastic strain

γ :

Indenter Geometry constant

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Acknowledgments

The authors are grateful to the Vice chancellor, DIAT (DU), Pune for granting permission to publish this paper. The help provided by technical staff at Central Manufacturing Technology Institute (CMTI), Bangalore to use the facilities for conducting nanoindentation experiments.

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Authors and Affiliations

  1. Department of Mechanical Engineering, CMRIT, Hyderabad, A.P, 501401, India

    B. SridharBabu

  2. Department of Mechanical Engineering, Defence Institute of Advanced Technology (DU), Pune, 411025, India

    A. Kumaraswamy

  3. Department of Mechanical Engineering, Jawaharlal Nehru Technological University, Hyderabad, 500085, India

    B. AnjaneyaPrasad

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  1. B. SridharBabu
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  2. A. Kumaraswamy
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  3. B. AnjaneyaPrasad
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Correspondence to A. Kumaraswamy.

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SridharBabu, B., Kumaraswamy, A. & AnjaneyaPrasad, B. Effect of Indentation Size and Strain Rate on Nanomechanical Behavior of Ti-6Al-4VAlloy. Trans Indian Inst Met 68, 143–150 (2015). https://doi.org/10.1007/s12666-014-0438-z

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