低温下ZL101合金中位错运动对Si相断裂的影响

马广辉; 李润霞; 白彦华; 李荣德

doi:10.15980/j.tzzz.2015.11.001

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低温下ZL101合金中位错运动对Si相断裂的影响
Effect of Dislocation Motion on Damaged Si Particle in ZL101 Alloy at Low Temperature
2015年35卷第11期页码：1121-1125
纸质出版日期： 2015 ，
DOI： 10.15980/j.tzzz.2015.11.001

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[1]马广辉,李润霞,白彦华,李荣德.低温下ZL101合金中位错运动对Si相断裂的影响[J].特种铸造及有色合金,2015,35(11):1121-1125.

Ma Guanghui, Li Runxia, Bai Yanhua, et al. Effect of Dislocation Motion on Damaged Si Particle in ZL101 Alloy at Low Temperature[J]. Special Casting & Nonferrous Alloys, 2015,35(11):1121-1125.
[1]马广辉,李润霞,白彦华,李荣德.低温下ZL101合金中位错运动对Si相断裂的影响[J].特种铸造及有色合金,2015,35(11):1121-1125. DOI： 10.15980/j.tzzz.2015.11.001.

Ma Guanghui, Li Runxia, Bai Yanhua, et al. Effect of Dislocation Motion on Damaged Si Particle in ZL101 Alloy at Low Temperature[J]. Special Casting & Nonferrous Alloys, 2015,35(11):1121-1125. DOI： 10.15980/j.tzzz.2015.11.001.

摘要

研究了ZL101合金在-60℃和20℃时拉伸断裂后组织中Si相的断裂行为。结果表明

ZL101合金在低温下拉伸断裂后组织中断裂Si相的数量增加。合金在塑性变形过程中产生大量位错滑移

位错在Si相边界塞积产生应力集中使Si相断裂。随着温度降低

ZL101合金的切变模量增大

导致局部变形区的位错应力场阻力随位错密度增大而上升的趋势加剧

因此

当局部变形较小时

合金在非局部变形区产生大量的位错并滑移

变形均匀性上升。

Abstract

The fracture behavior of Si particles in Zl101 alloy after tensile testing at-60℃and 20℃ was analyzed.The results show that the number of damaged Si particle is increased in the ZL101 alloy at a lower temperature.There exist lots of dislocations motion during the plastic deformation

which are piled up in ahead of Si particles

leading to the Si particles fracture.Due to the increase of shearing modulus with the decrease of temperature

the resistance of dislocation motion is increased rapidly at the local deformation zone with the dislocation density increase

and the dislocation multiply easily outside the local deformation zone

so the plastic deformation of ZL101 is more homogeneous at low temperature.