W. Tang, Xiuyan Li, Enhou Han, Yong-bo Xu, Yiyi Li
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引用次数: 4
摘要
在77K ~ 298K范围内，研究了温度对AZ80变形镁合金变形和失效行为的影响。结果表明，随着温度的降低，合金的屈服强度(YS)和极限强度(UTS)逐渐升高，而伸长率则逐渐降低，在213K ~ 143K之间表现得尤为明显。通过力学试验、环境扫描电镜(ESEM)和透射电镜(TEM)观察，认为合金变形主要以滑移和孪晶变形为主，但在试验温度范围内发生不同的解理机制。在tbbb213k时，由于位错可以穿过孪晶，但在Mg17Al12析出相堆积，导致裂纹形核，合金的塑性较高。在T<143K时，由于位错滑移受到极大抑制，位错在孪晶处堆积，导致裂纹迅速形核并沿孪晶扩展，合金塑性较低。在143 k
Deformation Behavior of AZ80 Wrought Magnesium Alloy at Cryogenic Temperatures
The influence of temperature on the deformation and failure behavior of AZ80 wrought Mg alloy has been examined from 77K to 298K. It is found that the yield strength (YS) and ultimate strength (UTS) are increasing with the temperature decreasing, while the elongation is decreasing especial between 213K and 143K. Based on the mechanical tests, observation of environmental scanning electron microscope (ESEM) and transmission electron microscope (TEM), it is proposed that the alloy deforms mainly by slips and twins, but undergoes different mechanism of cleavage in the range of testing temperature. At T>213K, the alloy ductility is higher because the dislocations could pass through twins but pile up at precipitate phase: Mg17Al12, which causes the crack nucleate. At T<143K, the alloy ductility is lower because the dislocation slip are suppressed greatly and dislocations pile up at twins, and cause crack nucleate and expand along twins quickly. At 143K
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