Grain Size Effect on Deformation Twinning and De-Twinning in a Nanocrystalline Ni-Fe Alloy

摘要：

The effect of grain size on the deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy was investigated using transmission electron microscopy. Specimens with different grain sizes were obtained by severely deforming an electrochemically deposited nanocrystalline Ni-20wt.% Fe alloy using high-pressure torsion, which resulted in continuous grain growth from an average grain size of～21 nm in the as-deposited material to～72 nm for the highest strain applied in this study. Results show that deformation de-twinning occurs at very small grain sizes while deformation twinning takes place when the grain size is larger than～45 nm. The mechanism of the observed grain size effect on twinning and detwinning is briefly discussed.

作者: S.Ni Y.B.Wang X.Z.Liao S.N.Alhajeri H.Q.Li S.P.Ringer T.G.Langdon Y.T.Zhu

作者单位: School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,Sydney,NSW 2006, Department of Manufacturing Engineering,College of Technological Studies,PAAET,Shuwaikh 70654,Kuwait Los Alamos National Laboratory,Los Alamos,New Mexico 87545,USA Australian Centre for Microscopy & Microanalysis,The University of Sydney,NSW 2006,Australia Departments of Aerospace & Mechanical Engineering and Materials Science,University of Southern Calif Department of Materials Science & Engineering,North Carolina State University,Raleigh,NC 27659-7919,

会议类型: 国际会议

会议名称: 5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)

会议地点: 南京

会议语种:英文

页码: 181-186

在线出版日期: 2011-03-01（万方平台首次上网日期，不代表论文的发表时间）