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Research Papers: JOINING

Microstructure Stability During Creep of Friction Stir Welded AZ31B Magnesium Alloy

[+] Author and Article Information
Michael Regev

Associate Professor
Mem. ASME
Department of Mechanical Engineering,
ORT Braude College,
P.O. Box 78,
Karmiel 21982, Israel
e-mail: michaelr@braude.ac.il

Stefano Spigarelli

Full Professor
Dipartimento di Ingegneria Industriale e Scienze Matematiche (DIISM),
Università Politecnica delle Marche,
Via Brecce Bianche,
Ancona I-60131, Italy
e-mail: s.spigarelli@univpm.it

Marcello Cabibbo

Associate Professor
Dipartimento di Ingegneria Industriale e Scienze Matematiche (DIISM),
Università Politecnica delle Marche,
Via Brecce Bianche,
Ancona I-60131, Italy
e-mail: m.cabibbo@univpm.it

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received November 22, 2014; final manuscript received June 13, 2015; published online September 4, 2015. Assoc. Editor: Yannis Korkolis.

J. Manuf. Sci. Eng 137(5), 051021 (Sep 04, 2015) (8 pages) Paper No: MANU-14-1622; doi: 10.1115/1.4030879 History: Received November 22, 2014

Friction stir welding (FSW) was applied in the current study in order to butt weld AZ31B-H24 alloy plates. Creep tests were conducted both on the parent material and on the friction stir welded specimens. The microstructure of the AZ31B alloy was found to be unstable under creep conditions. In the case of friction stir welded AZ31B, the material undergoes during FSW both recrystallization and grain growth, then the exposure to temperature during creep yields an extensive additional grain growth. On the other hand, twinning and twin-induced recrystallization occur as well during creep so that ultrafine grains are being created concurrently.

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References

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Figures

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Fig. 1

General view of the welding system

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Fig. 3

Creep specimen's configuration

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Fig. 4

A drawing of a creep specimen

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Fig. 5

Minimum creep rate dependence on applied stress for the base alloy and the FSW samples

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Fig. 6

Time to rupture as a function of minimum creep rate for the base metal and the FSW samples

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Fig. 7

SEM micrograph of the parent metal

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Fig. 8

Optical micrographs of the various zones of the weld: (a) a scheme showing the various zones; (b) advancing side HAZ; (c) advancing side TMAZ; (d) nugget; (e) retreating side TMAZ; and (f) retreating side HAZ

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Fig. 9

(a) Bright field TEM micrograph taken near 〈21¯1¯0〉 zone axis of a broken specimen that had crept under 150 MPa at 100 °C; (b) bright field TEM micrograph taken near 〈21¯1¯0〉 zone axis of a broken specimen that had crept under 25 MPa at 300 °C; and (c) selected area electron diffraction pattern of 〈21¯1¯0〉 zone axis

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Fig. 10

SEM image of thermally treated specimens at 100 °C for: (a) 1 hr; (b) 2 hrs; (c) 4 hrs; (d) 8 hrs; (e) 16 hrs; and (f) 32 hrs

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Fig. 11

SEM image of thermally treated specimens at 300 °C for: (a) 1 hr; (b) 2 hrs; (c) 4 hrs; (d) 8 hrs; (e) 16 hrs; and (f) 32 hrs

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Fig. 12

SEM images of broken creep specimens that had crept under 200 °C and 20 MPa: (a) low magnification and (b) high magnification

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Fig. 13

SEM image of the fracture surface a creep specimen that had crept at 100 °C under 150 MPa

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