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金属学报  2020, Vol. 56 Issue (5): 776-784    DOI: 10.11900/0412.1961.2019.00277
  本期目录 | 过刊浏览 |
纳米孔洞对单晶/多晶Ni复合体拉伸性能的影响
李源才, 江五贵(), 周宇
南昌航空大学航空制造工程学院 南昌 330063
Effect of Nanopores on Tensile Properties of Single Crystal/Polycrystalline Nickel Composites
LI Yuancai, JIANG Wugui(), ZHOU Yu
School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
全文: PDF(2964 KB)   HTML
摘要: 

采用分子动力学方法研究了预制纳米孔洞缺陷对单晶/多晶Ni复合体拉伸性能的影响。结果表明,与多晶Ni相比,单晶Ni能够提高单晶/多晶Ni复合体的抗拉强度。对比了孔洞位置分布对单晶/多晶Ni复合体拉伸性能的影响。模拟结果表明,处于单晶区域的纳米孔洞缺陷显著加剧了单晶/多晶Ni复合体界面的断裂。相反,孔洞处于多晶区域时,界面一侧的单晶Ni阻碍了多晶Ni侧非晶化的传播,抑制了孔洞向界面一侧的单晶扩展。随后讨论了界面孔洞的孔隙率对单晶/多晶Ni复合体拉伸性能的影响。结果表明,当孔隙率超过0.8%后,单晶/多晶Ni复合体的抗拉强度迅速下降。最后分析了当保持界面孔洞孔隙率不变的情况下空洞数量对拉伸性能的影响,结果显示,相比于大孔洞,分散的小孔洞具有更好的拉伸性能。

关键词 分子动力学预制纳米孔洞单晶/多晶Ni复合体拉伸性能孔洞位置孔隙率    
Abstract

The performance of the new generation aero-engine is strongly dependent on the application of integral blisk technologies, while the high-risk failure of integral disk joints severely restricts the promotion of those technologies. Therefore, the molecular dynamics method is used to investigate the influence of nanopores on the tensile properties of single crystal/polycrystalline Ni composites. The results show that the addition of single crystal nickel can increase the tensile strength of single crystal/polycrystalline Ni compared with polycrystalline nickel. The influence of pore position distribution on the tensile properties of single crystal/polycrystalline Ni is investigated. The simulation results show that nanopore defects in a single crystal region significantly aggravate the fracture at the single crystal/polycrystalline Ni interface. Pores not only penetrate the interface of composites but also rapidly expand inside the single crystal and the polycrystalline crystal, in which the interface of composites is further reduced resulting in the failure acceleration of single crystal/polycrystalline Ni composites. On the contrary, when the pores are in a polycrystalline region, the interface of single crystal/polycrystalline Ni hinders the amorphization of the polycrystalline nickel side and inhibits the pores from spreading toward the interface. When the pores are in the interface region, the pores do not continue to expand into the single crystal, but propagate inside the polycrystalline crystal. The effect of the porosity of interface pores on the tensile properties of single crystal/polycrystalline Ni is also discussed. It is found that the tensile strengthof single crystal/polycrystalline Ni decreases rapidly when the void porosity exceeds 0.8%. Finally, the influence of the number of voids on the tensile properties while maintaining the porosity of the interface pores is analyzed. When the porosity of the prefabricated pores of the interface is kept constant at 0.8%, the larger the number of pores (i.e., the smaller the pores), the larger the elastic modulus. In the plastic deformation stage, due to the large number of dispersed small pore structures at the interface of the single crystal/polycrystalline Ni composites, the dislocation motion is hindered, which plays a certain strengthening role and improves the tensile strength of the single crystal/polycrystalline Ni composites. It can be concluded that single crystal/polycrystalline Ni with dispersed small pores has better tensile properties than those with large pores.

Key wordsmolecular dynamics    prefabricated nanopore    single crystal/polycrystalline Ni composites    tensile property    pore location    porosity
收稿日期: 2019-08-19     
ZTFLH:  TB31  
基金资助:国家自然科学基金项目(11772145)
通讯作者: 江五贵     E-mail: jiangwugui@nchu.edu.cn
Corresponding author: JIANG Wugui     E-mail: jiangwugui@nchu.edu.cn
作者简介: 李源才,男,1987年生,硕士生

引用本文:

李源才, 江五贵, 周宇. 纳米孔洞对单晶/多晶Ni复合体拉伸性能的影响[J]. 金属学报, 2020, 56(5): 776-784.
Yuancai LI, Wugui JIANG, Yu ZHOU. Effect of Nanopores on Tensile Properties of Single Crystal/Polycrystalline Nickel Composites. Acta Metall Sin, 2020, 56(5): 776-784.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00277      或      https://www.ams.org.cn/CN/Y2020/V56/I5/776

图1  单晶Ni和多晶Ni分子动力学模型及单晶/多晶Ni复合体预制孔洞示意图(预制孔洞中心相距d=4、8或10 nm)
图2  无预制孔洞与孔洞半径为1.1 nm时不同晶态Ni应力-应变曲线
图3  无预制孔洞和不同位置预制孔洞单晶/多晶Ni复合体的拉伸应力-应变曲线
图4  不同应变(ε)下单晶预制孔洞半径为0.6 nm,多晶预制孔洞半径为0.5 nm和单晶/多晶界面预制孔洞半径为0.6 nm的拉伸原子图
图5  无预制孔洞和不同界面预制孔洞数量(N)下单晶/多晶Ni复合体的应力-应变曲线和弹性模量变化曲线
图6  不同应变下单晶/多晶Ni复合体界面预制孔洞半径为0.5848 nm时的拉伸原子图
图7  不同应变下单晶/多晶Ni复合体径向分布函数(G(r))
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