Form-free size distributions from complementary stereological TEM/SAXS on precipitates in a Mg-Zn alloy

Abstract

This work describes a multidisciplinary research methodology for quantifying the size distribution of nanoscale precipitates in polycrystalline alloys. Complementary transmission electron microscopy (TEM) and small-angle x-ray scattering (SAXS) are employed in a study of precipitate growth in an isothermally aged Mg-Zn alloy. TEM is used to identify the precipitate phases as rod-shaped β' particles and to determine their radii and aspect ratio. Subsequently, SAXS data obtained from bulk quantities of the alloy is interpreted via a novel Monte-Carlo method to obtain accurate, form-free size distributions. Good agreement was obtained between particle radii distributions measured by both methods, exemplifying the applicability of this complementary methodology to study precipitation in textured alloys containing particles anisotropic with well-defined orientation-relationships to the matrix.

Author accepted manuscript, 23 pages, 11 figures

References in corpus (6)

• Everything SAXS: Small-angle scattering pattern collection and correction
• Improvements and considerations for size distribution retrieval from small-angle scattering data by Monte-Carlo methods
• The effect of precipitation on strength and ductility in a Mg-Zn-Y alloy
• The effect of size and distribution of rod-shaped β' precipitates on the strength and ductility of a Mg-Zn alloy
• Structural relationships among monoclinic and hexagonal phases and transition structures in Mg-Zn-Y alloys
• The optimal division between sample and background measurement time for photon counting experiments

Cited by in corpus (3)

• Nanoparticle Size Distribution Quantification: Results of a SAXS Inter-Laboratory Comparison
• Critical assessment of the evidence for striped nanoparticles
• McSAS: A package for extracting quantitative form-free distributions