Stress-relaxation and creep behaviour of some rapidly solidified magnesium alloys

Gjestland, Haavard; Nussbaum, G.; Regazzoni, G.; Lohne, O.; Bauger, Øystein

doi:10.1016/0921-5093(91)90954-l

Cited by 58 publications

(20 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A wide spectrum of rapidly solidified magnesium alloys have been investigated (19,20). Unlike rapidly solidified Al-alloys, which may show considerable supersaturation of the alloying elements, rapidly s 0 1 i~e d Mg-alloys are mainly characterized by a refinement of grain structure and dispersion of intermetallic particles.…”

Section: Rapid Solidificationmentioning

confidence: 99%

See 1 more Smart Citation

Magnesium alloys for structural applications ; recent advances

Westengen

1993

J. Phys. IV France

View full text Add to dashboard Cite

Magnesium alloys possess unique properties, which when fully exploited can open up for major inroads into important markets for structural applications. A density of 213 that of Al, and only slightly higher than for fibre reinforced plastics, combined with excellent mechanical and physical properties as well as processability and recyclability, make magnesium aLloys an obvious choice when designing for light weight. The paper summarizes some basic aspects of magnesium alloying practice, and describes the main commercial alloys. A selection of special developments are described with emphasis on the interaction between material properties and processing parameters.

show abstract

Section: Rapid Solidificationmentioning

confidence: 99%

“…Hall Petch relation describing the Figure 18. Stress relaxation behaviour of conveninfluence of grain size on tensile yield tional and rapidly solidified materials strength (20).…”

Section: Rapid Solidificationmentioning

confidence: 99%

Magnesium alloys for structural applications ; recent advances

Westengen

1993

J. Phys. IV France

View full text Add to dashboard Cite

show abstract

“…[1][2][3] The poor creep resistance of the conventional magnesium alloys has hindered the applications for the major powertrain components such as transmission and engine parts, where the operating temperatures can be as high as 450 K. 4) Owing to the recent efforts to develop creep resistant magnesium alloys for such applications the cost effective Mg-Al-Ca alloys have been successfully developed. [5][6][7][8][9] The compositions of the alloys are located in the range of 4.5-9.0 mass%Al and 0.3-2.3 mass%Ca as reviewed by Luo 10) and Pekguleryuz and Kaya. 11) Many of magnesium parts used for the automotive applications are produced by die casting.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Stability and Creep Strength in a Die-Cast AX52 Magnesium Alloy

2005

View full text Add to dashboard Cite

Superior creep strength of a heat resistant AX52 magnesium alloy is ascribed to the grain boundary eutectic Al 2 Ca phase covering the primary -Mg grains. The eutectic phase is stable in morphology at temperatures below 473 K, while it collapses during long term exposure at temperatures higher than 473 K. The microstructural change of the alloy during high temperature exposure is characterized by the decrease in the grain boundary coverage by the eutectic phase. The creep strength of the alloy decreases with the decrease in the grain boundary coverage, and the correlation between the creep strength and the grain boundary coverage is discussed.

show abstract

“…[19][20][21][22] Among the alloying elements described above, calcium is both a cost effective and lighter alternative to rare-earth elements for improving high-temperature creep strength of Mg-Al alloys. [23][24][25][26][27] Phase equilibria 28,29) and liquid projections 30) in the Mg-Al-Ca ternary system have been clarified by experimental methods and via thermodynamic modeling with particular emphasis on the Mg-rich corner. The aim of the present study is to elucidate the effect of calcium additions on creep properties for the AM50 die-cast alloy in the temperatures above 423 K.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcium Additions on Creep Properties of a Die-Cast AM50 Magnesium Alloy

2008

View full text Add to dashboard Cite

Tensile creep tests have been carried out for the die-cast AM50 + xCa (x ¼ 0:47, 0.95 and 1.72 mass pct) alloys in the temperatures between 423 and 523 K to elucidate the effect of calcium additions on creep properties for the AM50 alloy. The creep curve for the AM50 + xCa alloys is characterized by a minimum in the creep rate followed by an extended accelerating stage, and the decrease in creep rate during transient stage becomes pronounced with calcium concentration. The creep strengthening by calcium addition is emphasized at lower stresses and lower temperatures, resulting in the positive dependence of creep parameters, n and Q c , against calcium concentration. It is found that the eutectic intermetallic phase covering the primary grains detected in the AM50 + xCa alloys prevents the dislocation annihilation at grain boundaries. The creep strengthening by the addition of calcium results from both the solid solution strengthening of the matrix by solute calcium and the retardation of dislocation annihilation attributed to the eutectic intermetallic phase.

show abstract

Stress-relaxation and creep behaviour of some rapidly solidified magnesium alloys

Cited by 58 publications

References 1 publication

Magnesium alloys for structural applications ; recent advances

Magnesium alloys for structural applications ; recent advances

Microstructure Stability and Creep Strength in a Die-Cast AX52 Magnesium Alloy

Effect of Calcium Additions on Creep Properties of a Die-Cast AM50 Magnesium Alloy

Contact Info

Product

Resources

About