Internal friction in Al bicrystals with ⟨111⟩ tilt and twist grain boundaries

被引：13

作者：

Jiang, W. B. ^{[2
]}

Kong, Q. P. ^{[2
]}

Cui, P. ^{[2
]}

Fang, Q. F. ^{[2
]}

Molodov, D. A. ^{[1
]}

Gottstein, G. ^{[1
]}

机构：

[1] Univ Aachen, Rhein Westfal TH Aachen, Inst Phys Met & Met Phys, D-52056 Aachen, Germany

[2] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

来源：

PHILOSOPHICAL MAGAZINE | 2010年 / 90卷 / 06期

基金：

中国国家自然科学基金;

关键词：

internal friction; grain boundary; bicrystal; STRUCTURE-ENERGY CORRELATION; FCC METALS; DIFFUSION; ALUMINUM; TEMPERATURE; DEFORMATION; DEPENDENCE; ORIENTATION; RELAXATION; FLEXION;

D O I：

10.1080/14786430903258192

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Internal friction measurements were performed on various < 111 > tilt and twist grain boundaries in high-purity Al bicrystals. The temperature dependence of the grain boundary internal friction peak was determined, and the activation parameters of grain boundary relaxation were obtained. These parameters were found to change in a wide range depending on boundary geometry. The activation enthalpy of boundary relaxation and the pre-exponential factor of the relaxation time are related according to the compensation effect. The results are discussed in terms of the model of correlated relaxations. Bicrystals with vicinal Sigma 3 boundaries were observed to behave like single crystals,i. e. an internal friction peak did not appear. This evidences that both coherent and incoherent (60 degrees < 111 > tilt) twins possess a high mechanical resistance.

引用

页码：753 / 764

页数：12

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