Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 902, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.163732
Keywords
Mg -Li -Al alloys; Grain boundary; Precipitation free zones; Brittle fracture
Categories
Funding
- National Natural Science Foundation of China [52101142, 51871120, 51901047]
- Natural Science Foundation of Jiangsu Province [BK20200503]
- China Postdoctoral Science Foundation [2021M691583]
- Fundamental Research Funds for the Central Universities [30921011218]
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This study investigates the fracture behavior and underlying mechanisms of BCC Mg-Li-Al alloys. The narrow precipitation free zones, shearing of intragranular precipitates, and grain boundary precipitates are identified as the main factors contributing to grain boundary de-cohesion.
Body-centered cubic (BCC) Mg-Li alloy can be effectively strengthened by Al addition. However, brittle fracture degrades the ductility. Further improvement in mechanical properties requires a deep under -standing of the fracture mechanism. In this work, we investigate the fracture behaviour of BCC Mg-Li-Al alloys and probe underneath mechanisms. Three factors are likely responsible for the grain boundary de-cohesion: narrow precipitation free zones provide dislocations initiation and slip pathway; shearing of intragranular precipitates by planar slip will cause large stress concentration to GBs at the end of slip bands; grain boundary precipitates of Al-rich ordered phases weaken the interatomic bonding among grains. Once the stress locally exceeds GB cohesion, cracking nucleates and propagates along/through GBs and inter-granular/cleavage fracture takes place. (c) 2022 Elsevier B.V. All rights reserved.
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