黄霞,王路生,郑浩然,田宇,丁军,宋鹍,路世青.微缺陷对B2-NiAl高温涂层材料力学性能及失效机理的影响[J].表面技术,2019,48(1):10-21.
HUANG Xia,WANG Lu-sheng,ZHENG Hao-ran,TIAN Yu,DING Jun,SONG Kun,LU Shi-qing.Effect of Micro-defects on the Mechanical Properties and Failure Mechanism of B2-NiAl High Temperature Coatings[J].Surface Technology,2019,48(1):10-21
微缺陷对B2-NiAl高温涂层材料力学性能及失效机理的影响
Effect of Micro-defects on the Mechanical Properties and Failure Mechanism of B2-NiAl High Temperature Coatings
投稿时间:2018-09-18  修订日期:2019-01-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.01.002
中文关键词:  B2-NiAl  热障涂层  失效机理  力学性能  分子动力学
英文关键词:B2-NiAl  thermal barrier coatings  failure mechanism  mechanical properties  molecular dynamics
基金项目:国家自然科学基金联合基金项目(U1530140);重庆市教育委员会科学技术研究项目(KJ1709224,KJ1600919);重庆市基础与前沿研究计划项目(CSTC2016JCYJA0517,CSTC2017JCYJAX0357);计算物理国防重点实验室基金(6142A0501020217)
作者单位
黄霞 重庆理工大学 机械工程学院,重庆 400054 
王路生 重庆理工大学 机械工程学院,重庆 400054 
郑浩然 重庆理工大学 机械工程学院,重庆 400054 
田宇 重庆理工大学 机械工程学院,重庆 400054 
丁军 重庆理工大学 机械工程学院,重庆 400054 
宋鹍 重庆理工大学 机械工程学院,重庆 400054 
路世青 重庆理工大学 机械工程学院,重庆 400054 
AuthorInstitution
HUANG Xia School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
WANG Lu-sheng School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
ZHENG Hao-ran School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
TIAN Yu School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
DING Jun School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
SONG Kun School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
LU Shi-qing School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China 
摘要点击次数:
全文下载次数:
中文摘要:
      目的 研究微缺陷对B2-NiAl高温涂层材料在拉伸载荷作用下的变形行为和失效机理的影响。 方法 在考虑裂纹和孔洞等微缺陷的影响下,采用嵌入原子势函数(EAM)和分子动力学方法,模拟了完美B2-NiAl涂层(Sample 1)、含中心对称微裂纹涂层(Sample 2)、含有中心微裂纹与单微孔洞涂层(Sample 3)和含有中心微裂纹与双微孔洞涂层(Sample 4)模型的失效过程,利用键对分析技术(CAN)、中心对称参数法(CSP)和径向分布函数(RDF),对涂层的变形过程和失效机理进行了分析表征。结果 随着微缺陷的增加,高温材料的屈服应力会明显下降,弹性模量也会有所降低,屈服应变逐渐减小,但微孔洞会使涂层出现二次屈服现象。完美B2-NiAl高温涂层在屈服后的位错和相变区域面积较小,分布比较均匀,在边界处萌发裂纹并沿(100)方向扩展,再沿着(111)方向扩展,直至失效。相比完美B2-NiAl高温涂层,含有微裂纹和孔洞的涂层在屈服后的位错和相变区域较小,主要在裂纹尖端沿着<111>滑移系方向均匀分布,但其主裂纹沿着[100]方向扩展并导致断裂。结论 微裂纹会降低B2-NiAl高温涂层的强度,但微孔洞会提高其塑性。应力集中会导致微裂纹萌生并在裂纹尖端附近产生微孔洞,使其与主裂纹贯通直至失效,而位错塞积则是造成应力集中的主要原因。
英文摘要:
      The work aims to investigate the effects of micro-defects on deformation behavior and failure mechanism of high temperature coating B2-NiAl under uniaxial tensile load. In consideration of micro-defects like cracks, voids, etc., EAM and molecular dynamics were used to simulate the failure process of B2-NiAl coating without defects (sample 1), B2-NiAl coating with central symmetric micro-crack (sample 2), B2-NiAl coating with central micro-crack and single void (sample 3) and B2-NiAl coating with central micro-crack and double voids (sample 4). The common neighbor analysis (CNA), centrosymmetric parameter method (CSP) and radial distribution function (RDF) were used to analyze and characterize the failure process and mechanism of B2-NiAl. With the increase of micro-defects, the yield stress, Young’s modulus and yield strain decreased, while the second yielding phenomena appeared due to the existence of micro voids in the tension process. The dislocation and phase transformation area of B2-NiAl high temperature coating without defects became smaller after the yielding, but were distributed evenly. The crack would extend along the (100) direction first and then the (111) direction until failure. Compared with the perfect B2-NiAl high temperature coating, the dislocation and phase transformation area of B2-NiAl coating with micro cracks and voids became smaller after the yielding and were mainly distributed along the sliding direction of crack tip <111>. The crack only extended along the [100] until failure. In addition, micro crack can decrease the strength of B2-NiAl, but micro void can improve the plasticity. Stress concentration caused by dislocation stack can lead to micro cracks and micro voids near the crack tip to connect the main crack until the failure.
查看全文  查看/发表评论  下载PDF阅读器
关闭

关于我们 | 联系我们 | 投诉建议 | 隐私保护 | 用户协议

您是第19505156位访问者    渝ICP备15012534号-3

版权所有:《表面技术》编辑部 2014 surface-techj.com, All Rights Reserved

邮编:400039 电话:023-68792193传真:023-68792396 Email: bmjs@surface-techj.com

渝公网安备 50010702501715号