异步累积叠轧制备超细晶纯铜微观组织演化规律及细化机制

对纯铜进行一至三道次大塑性异步累积叠轧变形,观察显微组织及晶界的演变过程,并探讨了纯铜异步累积叠轧的晶粒细化机制。结果表明：纯铜异步累积叠轧形成S带;S带中形成连续的纵横交割位错墙,将S带分割、细化,获得具有亚晶结构的超细晶纯铜,亚晶尺寸为0.5～1μm。异步累积叠轧晶粒细化过程中,形成断断续续的分散状态的小角度亚晶界,在剪切力作用下逐渐合并成为超细晶粒中连续的小角度亚晶界。...

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Bibliographic Details
Published in航空材料学报 Vol. 34; no. 5; pp. 49 - 54
Main Author 周蕾 史庆南 王军丽
Format Journal Article
LanguageChinese
Published 昆明理工大学冶金与能源学院,昆明,650093%昆明理工大学材料科学与工程学院,昆明,650093%昆明理工大学分析测试中心,昆明,650093 2014
Subjects
S带
异步累积叠轧
晶界
纯铜
细化机制
异步累积叠轧
纯铜
refine mechanism
S带
grain boundaries
S-band
pure copper
Asymmetrical Accumulative Roll Bonding(AARB)
细化机制
晶界
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ISSN1005-5053
DOI10.11868/j.issn.1005-5053.2014.5.008

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Summary:对纯铜进行一至三道次大塑性异步累积叠轧变形,观察显微组织及晶界的演变过程,并探讨了纯铜异步累积叠轧的晶粒细化机制。结果表明：纯铜异步累积叠轧形成S带;S带中形成连续的纵横交割位错墙,将S带分割、细化,获得具有亚晶结构的超细晶纯铜,亚晶尺寸为0.5～1μm。异步累积叠轧晶粒细化过程中,形成断断续续的分散状态的小角度亚晶界,在剪切力作用下逐渐合并成为超细晶粒中连续的小角度亚晶界。
Bibliography:11-3159/V
Asymmetrical Accumulative Roll Bonding（AARB） ; pure copper; refine mechanism; S-band; grain boundaries
ZHOU Lei, SHI Qing-nan, WANG Jun-li （1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. Faculty of Science Materials and Engineering, Kunming University of Science and Technology, Kunming 650093, China; 3. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China）
The microstructure and grain boundaries of the copper prepared by Asymmetrical Accumulative Roll Bonding（AARB） within 1 to 3 passes were studied, and the grain refinement mechanism of AARB was obtained. The results show that S-band is obtained in AARB process. The S-band parted by the consecutive dislocation walls crosses inside, and the ultra-fine copper with sub-grains is prepared. Sub-grain boundaries with low-angle are obtained in the refine process of AARB. And with the shear stress,these discontinuous low-ang
ISSN:1005-5053
DOI:10.11868/j.issn.1005-5053.2014.5.008