Abstract
The tensile properties of rare-earth containing Mg-1.9Mn-0.3Ce alloy sheet along the rolling direction were experimentally investigated within the strain rate and temperature ranges of 0.001–1300 s−1 and 213–488 K. The obtained stress-strain responses of the alloy sheet indicate that both yield strength and strain-hardening rate increase when the strain rate increases, whereas they decrease with increase of temperature. Microscopic examination results show that basal slip, prismatic slip, and {101¯2} tension twinning take place in the tensile plastic deformation, while the occurrence of twinning is not obviously affected by the rate and temperature. Tensile samples tend to fracture in a ductile mode with increasing strain rate and temperature.
Highlights
Due to excellent balance between light weight and high strength, magnesium and its alloys have been widely utilized instead of traditional metals [1,2,3,4,5]
The tensile plastic deformation mechanism in magnesium alloys is found to be related to the loading rate and temperature, and it is generally known that the basal and non-basal slips dominate the tensile plastic deformation of magnesium alloys
Metals 2020, 10, 1473 temperature, and the results indicated that basal slip is dominant in tensile plastic deformation, and the contribution of the slips to plastic deformation decreases with the increase of rate
Summary
Due to excellent balance between light weight and high strength, magnesium and its alloys have been widely utilized instead of traditional metals [1,2,3,4,5]. Rare-earth containing Mg-1.9Mn-0.3Ce alloy is commonly used as a structural component in aerospace and warship industries, where these components maybe subjected to high-speed loadings under extreme ambient temperatures in manufacture and service [8,13]. It is necessary to understand the stress-strain responses of this alloy at high loading rates and various temperatures under both tension and compression loadings due to the fact that tension-compression asymmetry of mechanical behavior commonly exists in magnesium alloys. Owing to the technical complexity for high-rate tensile testing, most experimental investigations concerning high-rate plastic deformation of rare-earth containing magnesium alloys focus on compressive loadings. As for the tensile stress, strain responses of conventional magnesium alloys such as AZ31 and ZK60, as well as rare-earth-containing magnesium alloys like ZEK100, experimental investigations indicate that tensile properties of magnesium alloys exhibit positive loading-rate sensitivity and negative temperature sensitivity. Geng et al [14] carried out tensile tests on the magnesium alloy AZ31B at the rates of 2.8 × 10−5 to 1.1 × 10−1 s−1 at room
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