期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.10.037
关键词
Cu-Al-Ni alloy; Shape memory alloy; Grain boundary control; Mechanical properties
类别
资金
- Major States Basic Research Development Program (973 Program) of China [2011CB606300]
- National Natural Science Foundation of China [51504023]
- Fundamental Research Funds for the Central University [FRF-TP-15-051A2]
- State Key Lab of Advanced Metals and Materials Foundation [2014-Z06]
By combined martensitic transformation calculation based on phenomenological theory and in-situ tensile tests, it was demonstrated that the mechanical properties of polycrystalline Cu-Ni-Al alloys can be enhanced by changing the stress state and improving the strength of grain boundaries. The experimental results indicated that, compared with ordinary hot-rolled Cu-Al-Ni alloys, controlled grain growth by continuous unidirectional solidification can change the stress state of grain boundaries and restrain intergranular cracks caused by local stress concentration, thereby making a significant tensile strain increase of 21.3% and superelasticity strain increase of 15.2%. Minor addition of B can enhance the bonding strength of grain boundary and reduce the formation possibility of intergranular cracks, resulting in a maximum tensile strain and superelasticity strain increase to be 3.1% and 2.0% respectively. These results would provide a theoretical and experimental foundation for enhancing mechanical properties of polycrystalline Cu-Al-Ni alloys by grain boundary control. (C) 2015 Elsevier B.V. All rights reserved.
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