Multiscale microstructural characterization of Sn-rich alloys by three dimensional (3D) X-ray synchrotron tomography and focused ion beam (FIB) tomography

Journal Article · Wed Aug 15 00:00:00 EDT 2012 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2012.05.004· OSTI ID:22066479

Yazzie, K E; Williams, J J; Phillips, N C ^[1]; De Carlo, F ^[2]; Chawla, N ^[1]

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1. Materials Science and Engineering, School for the Engineering of Matter, Transport, and Energy (SEMTE), Arizona State University, Tempe, AZ 85287-6106 (United States)
2. Advanced Photon Source, Argonne National Laboratory, Building 401, 9700 S. Cass Avenue, Argonne, IL 60439 (United States)

Sn-rich (Pb-free) alloys serve as electrical and mechanical interconnects in electronic packaging. It is critical to quantify the microstructures of Sn-rich alloys to obtain a fundamental understanding of their properties. In this work, the intermetallic precipitates in Sn-3.5Ag and Sn-0.7Cu, and globular lamellae in Sn-37Pb solder joints were visualized and quantified using 3D X-ray synchrotron tomography and focused ion beam (FIB) tomography. 3D reconstructions were analyzed to extract statistics on particle size and spatial distribution. In the Sn-Pb alloy the interconnectivity of Sn-rich and Pb-rich constituents was quantified. It will be shown that multiscale characterization using 3D X-ray and FIB tomography enabled the characterization of the complex morphology, distribution, and statistics of precipitates and contiguous phases over a range of length scales. - Highlights: Black-Right-Pointing-Pointer Multiscale characterization by X-ray synchrotron and focused ion beam tomography. Black-Right-Pointing-Pointer Characterized microstructural features in several Sn-based alloys. Black-Right-Pointing-Pointer Quantified size, fraction, and clustering of microstructural features.

• OSTI ID: 22066479
• Journal Information: Materials Characterization, Vol. 70, Issue Complete; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER ALLOYS
INTERMETALLIC COMPOUNDS
ION BEAMS
LAMELLAE
LEAD ALLOYS
MICROSTRUCTURE
MORPHOLOGY
PARTICLE SIZE
PHOTON COMPUTED TOMOGRAPHY
PRECIPITATION
SOLDERED JOINTS
SPATIAL DISTRIBUTION
SYNCHROTRON RADIATION
TIN BASE ALLOYS
X RADIATION