Compressive deformation and yielding mechanisms in cellular Al alloys determined using x-ray tomography and surface strain mapping

被引：10

作者：

Bart-Smith, H ^{[1
]}

Bastawros, AF ^{[1
]}

Mumm, DR ^{[1
]}

Evans, AG ^{[1
]}

Sypeck, DJ ^{[1
]}

Wadley, HNG ^{[1
]}

机构：

[1] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

POROUS AND CELLULAR MATERIALS FOR STRUCTURE APPLICATIONS | 1998年 / 521卷

关键词：

D O I：

10.1557/PROC-521-71

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanisms of compressive deformation that occur in closed cell Al alloys have been established This has been achieved by using x-ray computed tomography (CI) and surface strain mapping to determine the deformation modes and the cell morphologies that control the onset of yielding. The deformation is found to localize in narrow bands having width of order of a cell diameter. Outside the bands, the material remains elastic. The cells within the bands that experience large permanent strains are primarily elliptical. A group of cells work collectively to allow large localized deformation. Size does not appear to be the initiator of the deformation bands. Equiaxed cells remain elastic. The implications for manufacturing materials with superior mechanical properties are discussed, Visualization of internal deformation of a closed cell AI alloy core, as part of a sandwich panel construction, is also possible using x-ray tomography. Preliminary results for a punch indentation test are presented.

引用

页码：71 / 81

页数：5