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Research Papers

Evaluation of Elastoplasticity-Dependent Creep Property of Magnesium Alloy With Indentation Method: A Reverse Numerical Algorithm and Experimental Validation

[+] Author and Article Information
Shoichi Fujisawa

Department of Precision Mechanics,
Chuo University,
1-13-27 Kasuga, Bunkyo,
Tokyo 112-8551, Japan

Akio Yonezu

Department of Precision Mechanics,
Chuo University,
1-13-27 Kasuga, Bunkyo,
Tokyo 112-8551, Japan
e-mail: yonezu@mech.chuo-u.ac.jp

Masafumi Noda

Magnesium Division,
Gonda Metal Industry Co., Ltd.,
1-1-16 Miyashimo, Chuo,
Sagamihara, Kanagawa 252-0212, Japan

Baoxing Xu

Department of Mechanical and
Aerospace Engineering,
University of Virginia,
Charlottesville, VA 22904
e-mail: bx4c@virginia.edu

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received May 20, 2016; final manuscript received August 29, 2016; published online February 1, 2017. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 139(2), 021004 (Feb 01, 2017) (9 pages) Paper No: MATS-16-1147; doi: 10.1115/1.4035280 History: Received May 20, 2016; Revised August 29, 2016

Magnesium (Mg) alloys have been widely used in automotive and aerospace industries due to its merits of exceptional lightweight, super strong specific strength, and high corrosion-resistance, where intermetallic compounds with a small volume are very critical to achieve these excellent performance. This study proposes a reverse analysis that can be employed to extract elastoplasticity-dependent creep property of commercial die-cast Mg alloys and their intermetallic compounds from instrumented indentation with two sharp indenters. First, the creep deformation that obeys the Norton's law (ε˙  = Aσn) is studied, and the parameters of A and n are determined from two indentation experiments conducted with different sharp indenters. Then, a numerical algorithm and dimensional function developed is extended to extract the elastoplasticity of various metallic materials by focusing on the loading stage of indentation experiments. By considering the full loading history with both linear increase and holding stages of loads, we propose a framework of reverse analysis to determine both elastoplasticity and creep properties simultaneously. Parallel indentation experiments on pure magnesium and aluminum and Mg alloys are performed, and the results agree well with the numerical predictions.

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References

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Figures

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Fig. 1

Microstructure of α-Mg and β-Mg17Al12 in die-cast magnesium alloy (AZ91D)

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Fig. 2

Relationship between indentation creep depth and creep time and indentation curve

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Fig. 3

Two-dimensional axisymmetric FEM model of indentation test with triangle indenter and input creep parameter

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Fig. 4

Relationship between indentation creep depth and creep time by changing the creep parameter, n

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Fig. 5

Dimensionless function of pure Mg obtained by 115 deg triangle indenter

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Fig. 6

Relationship between h˙/E*nAhmax and n estimated by indentation creep test of Fig. 2

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Fig. 7

Dimensionless function of pure Mg obtained by 115 deg triangle indenter. This compares with n−h˙/E*nAhmax curve estimated by indentation creep test for pure Mg.

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Fig. 8

Relationship between creep parameter A and n for 115 deg and 100 deg triangle indenters

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Fig. 10

Relationship between indentation creep depth and creep time for β-phase

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Fig. 9

Relationship between indentation creep depth and creep time for α-phase

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Fig. 11

Relationship between C/E* and σr/E* for 115 deg and 100 deg triangle indenters

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Fig. 12

Comparison of σr/E* estimated by experiment and σr/E*—slope and intercept of n−h˙/E*nAhmax curve for 115 deg triangle indenter (A = 2.5 × 10−10)

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Fig. 13

Flowchart of estimation process

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Fig. 14

Comparison of estimated σr/E* with input ones for 115 deg and 100 deg triangle indenter experiments

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Fig. 15

Comparison of estimated creep parameter with input ones

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