Enhanced mechanical properties of polycrystalline Cu-Al-Ni alloy through grain boundary orientation and composition control
Enhanced mechanical properties of polycrystalline Cu-Al-Ni alloy through grain boundary orientation and composition control
复制标题
通过晶界取向和成分控制增强多晶 Cu-Al-Ni 合金的机械性能
DOI：
10.1016/j.msea.2015.10.037
复制
发表时间：
2016
期刊：
影响因子：
6.4
通讯作者：
Xie Jianxin
中科院分区：
文献类型：
--
作者：
Fu Huadong;Song Shilei;Zhuo Longchao;Zhang Zhihao;Xie Jianxin
通过基于唯象理论的马氏体相变计算和原位拉伸试验相结合，证明了多晶Cu-Ni-Al合金的力学性能可以通过改变应力状态和提高晶界强度来提高。实验结果表明，与普通热轧Cu-Al-Ni合金相比，连续单向凝固控制晶粒长大可以改变晶界应力状态，抑制局部应力集中引起的晶间裂纹，使拉应变显着增加21.3%，超弹性应变增加15.2%。少量添加B可以增强晶界结合强度，降低晶间裂纹形成的可能性，导致最大拉伸应变和超弹性应变分别增加3.1%和2.0%。这些结果将为通过晶界控制提高多晶Cu-Al-Ni合金的力学性能提供理论和实验基础。
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.