(1. 东北大学 理学院 材料物理与化学研究所，沈阳 110004；
2. 东北大学 材料各向异性与织构教育部重点实验室，沈阳 110004；
3. 中国科学院 金属研究所 沈阳材料科学国家(联合)实验室，沈阳 110016)
摘 要:
关键字: 粗晶；纯锌；hcp结构；形变；损伤
under unidirectional tension and compression
（1. Institute of Materials Physics and Chemistry, College of Sciences, Northeastern University,
Shenyang 110004, China;
2. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern
University,Shenyang 110004, China;
3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, The Chinese
Academy of Sciences,Shenyang 110016, China）
Abstract:The deformation and damage behavior of coarse-grained pure zinc (purity of 99.995%), with typical hcp structure, were investigated under unidirectional tension and compression. The surface deformation features and fracture surfaces of all deformed samples were observed by optical microscopy and scanning electron microscopy. The results show that under unidirectional tensile deformation, this material exhibits a very poor plasticity. Only under the case that the strain rate is very low, does the pure zinc show somewhat of plasticity. The slip systems can hardly operate under this circumstance, and only a few deformation twins can be found. Cleavage fracture is the major mode of a final failure of samples. In contrast, the samples of pure Zn present much better plasticity under compressive tests than under tensile tests at comparable strain rates. The deformation and damage behavior are slightly distinctive under different compressive strains, consisting of twinning (including formation of secondary twins), slip deformation, cracking, etc. Grain boundaries act as varying roles under different loading conditions.
Key words: coarse-grained; pure zinc; hcp structure; deformation; damage
