Magnesium alloys have been increasingly used in the automobile, communication and aerospace industries due to their low density, high specific strength and good castability. Higher speed in vehicles, development in weaponry and high speed metal working all are characterized with high rates of loading. In current study, a cast magnesium alloys AZ91D has been investigated at strain rates in the range between 300 s-1 and 1250 s-1. Relatively uniform strain rates are observed at lower strain rates. However an exception is observed for maximum strain rate tested, where a nearly constant strain rate of 1252 s-1 is observed over most of the test duration. Approximately 25% increase in stress is noticed at a strain rate of 1252 s-1 as compare to the stress at a strain rate of 346 s-1. The alloy AZ91D is observed to be more strain rate sensitive for strain rate higher than 1000 s-1. A decrease in strain rate sensitivity is observed with increasing percentage strain in the specimen.
Magnesium alloys have been increasingly used in the automobile, communication and aerospace industries due to their
low density, high specific strength and good castability. Higher speed in vehicles, development in weaponry and high
speed metal working all are characterized with high rates of loading. In current study, two magnesium alloys AZ91D and
AM50 have been investigated at strain rates in the range between 300 s-1 and 1250 s-1. For AZ91D, the stress is first
increased and than decreased with strain rate between 335/ s-1 and 1175 s-1. For AM50, a monotonic increase in the stress
is observed with increasing strain rate from 438/ s-1 to 1238 s-1. The stress is much higher at higher strain rates than what
is at quasi-static strain rate for both alloys. For nearly same strain rate, higher stresses are observed for AZ91D than
AM50, although this difference is less at higher strain rates. The strain rate sensitivity of AZ91D first increased with
increasing strain rate and than decreased. In case of AM50, the strain rate sensitivity has an overall increasing trend.
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