Study on the Microstructure and Mechanical Property of High Strength Mg-Nd-Zn-Zr Alloy

Abstract:

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The microstructure and mechanical properties of Mg-3wt%Nd-0.2wt%Zn-0.4wt%Zr alloy in as-cast, solution-treated and solution-treated + peak-aged were investigated. The alloy had a cast structure with large intergranular Mg12Nd phase between the α-Mg matrix. After solution-treated, the intergranular Mg12Nd phase disappeared and lots of small Zr-containing particles distributed inside the grains. Small plate-like phases precipitated inside the grains strengthened the alloy to a high level after peak-aged at 200°C for 16 hours: the ultimate strength of the alloy up to 305 MPa, with considerable elongation rate 11%, and yield strength 140 MPa. The peak-aged samples also had good creep resistance, with strain rate less than 0.2% after 120 hours creep test under the condition of 110 MPa at 200°C. The minimum creep rate was about 4.64×10-9. The alloy had different fracture pattern in different states: as-cast state, intergranular fracture was the key pattern to failure; after solution-treated, the fracture pattern turned to cleavage transgranular fracture; after peak-aged, the alloy had a mixed fracture pattern of transgranular and intergranular, in which transgranular was the main style.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

433-436

DOI:

10.4028/www.scientific.net/MSF.546-549.433

Citation:

W. J. Ding et al., "Study on the Microstructure and Mechanical Property of High Strength Mg-Nd-Zn-Zr Alloy", Materials Science Forum, Vols. 546-549, pp. 433-436, 2007

Online since:

May 2007

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Price:

$35.00

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