Journal of Materials Engineering and Performance

, Volume 22, Issue 4, pp 1091–1107 | Cite as

Effect of Annealing Temperature in Al 1145 Alloy Sheets on Formability, Void Coalescence, and Texture Analysis

  • K. Velmanirajan
  • A. Syed Abu Thaheer
  • R. Narayanasamy
  • R. Madhavan
  • Satyam Suwas
Article

Abstract

This paper deals with a combined forming and fracture limit diagram and void coalescence analysis for the aluminum alloy Al 1145 alloy sheets of 1.8 mm thickness, annealed at four different temperatures, namely 200, 250, 300, and 350 °C. At different annealing temperatures these sheets were examined for their effects on microstructure, tensile properties, formability, void coalescence, and texture. Scanning electron microscope (SEM) images taken from the fractured surfaces were examined. The tensile properties and formability of sheet metals were correlated with fractography features and void analysis. The variation of formability parameters, normal anisotropy of sheet metals, and void coalescence parameters were compared with texture analysis.

Keywords

anisotropy forming fractography plastic behavior texture 

Nomenclature

σ

True stress

ε

True strain

ε1

True major strain

ε2

True minor strain

ε3

True thickness strain

εe

True effective strain

εm

True hydrostatic or mean strain

R-ratio

Plastic strain ratio (ratio of width to thickness strain)

n

Strain hardening index or exponent value

K

Strength coefficient value

Rav

Average plastic strain ratio or normal anisotropy = (R0 + R90 + 2R45)/4

ΔR

Planar anisotropy

nav

Average strain hardening index = (n0 + n90 + 2n45)/4

Kav

Average strength coefficient = (K0 + K90 + 2K45)/4

RD

Rolling direction

ND

Normal direction

TT

Strain condition of tension-tension region

PS

Plane strain condition

TC

Strain condition of tension-compression region

Va

Void area fraction

L/W

Length to width ratio of void

T

Triaxiality factor

γ12

Mohr’s circle Shear strain developed because of ε1 and ε2 ((ε1 − ε2)/2)

γ23

Mohr’s circle Shear strain developed because of ε2 and ε3 ((ε2 − ε3)/2)

γ13

Mohr’s circle Shear strain developed because of ε1 and ε3 ((ε1 − ε3)/2)

δd

Relative spacing of the ligaments between two consecutive voids

d-Factor

A parameter on the void analysis (ratio of the δd to the radius of the void)

ODF

Orientation distribution function

SEM

Scanning electron microscopy

RMA

Representative material area (i.e., the area chosen in the SEM image)

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Copyright information

© ASM International 2012

Authors and Affiliations

  • K. Velmanirajan
    • 1
  • A. Syed Abu Thaheer
    • 2
  • R. Narayanasamy
    • 3
  • R. Madhavan
    • 4
  • Satyam Suwas
    • 4
  1. 1.Department of Mechanical EngineeringVetriVinayaga College of Engineering and TechnologyTiruchirappalliIndia
  2. 2.Department of Mechanical EngineeringPET Engineering CollegeTirunelveliIndia
  3. 3.Department of Production EngineeringNational Institute of TechnologyTiruchirappalliIndia
  4. 4.Department of Materials EngineeringIndian Institute of ScienceBangaloreIndia

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