Modulus anomaly in magnesium matrix composites

Chowdhury, A. S. M. F.; Mari, Daniele; Schaller, R.

doi:10.1002/pssa.200925441

Cited by 3 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The elastic shear modulus G shows a decreasing trend when temperature increases, but also an unusual behaviour between 300 K and 400 K, where a plateau is observed. This behaviour was only observed in the magnesium matrix composites and interpreted as due to the interface thermal stress relaxation [11]. The Young's modulus was measured by means of a free-free bar apparatus [5].…”

Section: Resultsmentioning

confidence: 99%

Magnesium matrix composites as interesting HIDAMETS

Schaller

Mari²,

Chowdhury³

2011

View full text Add to dashboard Cite

Metal matrix composites, made of Mg or Mg-2wt.%Si matrices reinforced with C or SiC long fibres, were processed by gas-pressure infiltration. Such composites are an advantageous solution for developing light metallic materials, which exhibit simultaneously good mechanical properties and a high damping capacity. For instance C/Mg-Si composites have a specific Young's modulus more than 4 times and a damping capacity 10-100 times higher than steels or aluminium alloys. The thermal behaviour of these materials was investigated by mechanical spectroscopy. Thermal stress relaxation at interfaces gives rise to transient damping, which is interpreted as being due to hysteretic dislocation motion. Hysteretic dislocation motion is also responsible for the mechanical loss background. As this mechanism is not thermally activated, high damping is maintained in a wide frequency and temperature range.

show abstract

Section: Resultsmentioning

confidence: 99%