The microstructure, tensile properties, and creep behavior of Mg-Zn alloys containing 0-4.4 wt.% Zn

C. J. Boehlert, K. Knittel

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Abstract

This paper describes the microstructure, tensile, and tensile-creep behavior of a series of Mg-Zn alloys ranging from 0 to 4.4 wt.% Zn. The microstructures consisted of equiaxed hexagonal-close-packed grains with fine precipitates preferentially located at grain boundaries. Some of the microstructures contained fine laths within the equiaxed grains. The finest grain sizes were observed for a Zn composition of 4 wt.%. Tensile experiments were performed at room temperature and 150 °C while creep experiments were conducted at 150 °C for applied stresses between 30 and 50 MPa. The greatest tensile and creep resistance was exhibited by Mg-4.1Zn which contained 0.2 wt.% Y. The measured creep exponent for the Mg-4.1Zn alloy was 4.2, suggesting dislocation climb as the dominant creep mechanism. Overall, Zn proved to be a potent grain refiner and strengthener for Mg where 4 wt.% appeared to be the optimal Zn content for tensile and creep strengthening over the range of alloying additions examined.

LanguageEnglish (US)
Pages315-321
Number of pages7
JournalMaterials Science and Engineering A
Volume417
Issue number1-2
DOIs
StatePublished - Feb 15 2006

Profile

tensile creep
tensile properties
Tensile properties
Creep
microstructure
Microstructure
creep strength
alloying
precipitates
grain boundaries
grain size
Creep resistance
exponents
Alloying
room temperature
Precipitates
Grain boundaries
Experiments
Chemical analysis

Keywords

  • Creep
  • Lightweight alloys
  • Magnesium
  • Microstructure
  • Tension

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

The microstructure, tensile properties, and creep behavior of Mg-Zn alloys containing 0-4.4 wt.% Zn. / Boehlert, C. J.; Knittel, K.

In: Materials Science and Engineering A, Vol. 417, No. 1-2, 15.02.2006, p. 315-321.

Research output: Contribution to journalArticle

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N2 - This paper describes the microstructure, tensile, and tensile-creep behavior of a series of Mg-Zn alloys ranging from 0 to 4.4 wt.% Zn. The microstructures consisted of equiaxed hexagonal-close-packed grains with fine precipitates preferentially located at grain boundaries. Some of the microstructures contained fine laths within the equiaxed grains. The finest grain sizes were observed for a Zn composition of 4 wt.%. Tensile experiments were performed at room temperature and 150 °C while creep experiments were conducted at 150 °C for applied stresses between 30 and 50 MPa. The greatest tensile and creep resistance was exhibited by Mg-4.1Zn which contained 0.2 wt.% Y. The measured creep exponent for the Mg-4.1Zn alloy was 4.2, suggesting dislocation climb as the dominant creep mechanism. Overall, Zn proved to be a potent grain refiner and strengthener for Mg where 4 wt.% appeared to be the optimal Zn content for tensile and creep strengthening over the range of alloying additions examined.

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