Evolution of the nanoporous microstructure of sintered Ag at high temperature using in-situ X-ray nanotomography
Source abstract
Abstract
Abstract Silver pastes sintering is a potential candidate for die bonding in power electronic modules. The joints, obtained by sintering, exhibit a significant pore fraction, thus reducing the density of the material compared to bulk silver. The mechanical properties (Young's modulus, yield strength and ultimate tensile stress) are then drastically altered. However, while careful analysis of the nanoporous structure has been reported in 2D, little is known about its quantitative spatial evolution during thermal aging and more specifically during temperature jumps endured by the assembly during operation. Here, high temperature evolutions of the 3D nanoporous structure have been observed in-situ using a heater fitted into the beamline 6-2c at SLAC-SSRL. Segmentation of the porosity and subsequent statistical analysis of the tomographic dataset reveal a complex evolution of the porous nanostructure including growth, separation and coalescence at a constant density. Such an analysis provides insight into the microstructural evolution of sintered nanoporous Ag joints in-service.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Nanoporous metals and alloys · Block Copolymer Self-Assembly · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (33)
Show source-provided references
1. Comparison of 6H-SiC, 3C-SiC, and Si for power devices10.1109/16.199372 ↗
2. State of the art of high temperature power electronics10.1016/j.mseb.2010.10.003 ↗
3. Are sintered silver joints ready for use as interconnect material in microelectronic packaging?10.1007/s11664-013-2967-3 ↗
4. Quantitative characterization of porosity and determination of elastic modulus of sintered micro-silver joints
5. Ageing of sintered silver: relationship between tensile behavior, mechanical properties and the nanoporous evolution10.1016/j.msea.2016.05.108 ↗
6. Deformation behavior of nanoporous polycrystalline silver. Part I: microstructure and mechanical properties10.1016/j.actamat.2017.04.021 ↗
7. A principle curvatures analysis of the isothermal evolution of nanoporous gold: quantifying the characteristic length-scales10.1016/j.actamat.2016.08.028 ↗
8. Quantitative X-Ray tomography10.1179/1743280413Y.0000000023 ↗
9. Fast in-situ 3D nanoimaging: a new tool for characterization in material science10.1016/j.mattod.2017.06.001 ↗
10. In-situ investigation by X-Ray tomography of the overall and local microstructural changes occurring during partial remelting of an Al-15.8 wt.% Cu alloy10.1016/j.actamat.2007.01.027 ↗
11. Structural evolution of nanoporous gold during thermal coarsening10.1016/j.actamat.2012.05.012 ↗
12. Influence of the porous microstructure on the elastic properties of sintered Ag as a replacement material for die attachment10.1007/s11664-015-3791-8 ↗
13. J. TXM-Wizard: a program for advanced data collection and evaluation in full-field transmission X-ray microscopy10.1107/S0909049511049144 ↗
14. Catching the time evolution of microstructure morphology from dynamic covariograms10.1016/j.crme.2015.02.005 ↗
15. Serra · 1988
16. Morphological skeleton representation and coding of binary images10.1109/TASSP.1986.1164959 ↗
17. Image analysis and mathematical morphology for civil engineering materials10.1016/S0958-9465(00)00058-5 ↗
18. High-strength nanoporous silver produced by inkjet printing10.1016/j.scriptamat.2010.04.021 ↗
19. Studies on the formation and transformation of solid bodies
20. The kinetics of precipitation from supersaturated solid solutions10.1016/0022-3697(61)90054-3 ↗
21. Analysis of particle growth by coalescence during liquid phase sintering10.1016/0001-6160(84)90207-4 ↗
22. Porosity regrowth during heat treatment of hot isostatically pressed additively manufactured titanium
23. Solid-state foaming of titanium by superplastic expansion of argon-filled pores10.1557/JMR.2001.0210 ↗
24. Effect of thermal history on the superplastic expansion of argon-filled pores in titanium: Part II modeling of kinetics10.1016/j.actamat.2004.01.019 ↗
25. TEM annealing study of normal grain growth in silver thin films
26. Sintering kinetics for high density alumina process
27. High temperature behavior of monodisperse porosity in alumina films10.1016/j.jeurceramsoc.2015.06.003 ↗
28. Microstructural evolution of sintered silver at elevated temperatures10.1016/j.microrel.2016.06.007 ↗
29. Advancing commercial feasibility of intraparticle expansion for solid state metal foams by the surface oxidation and room temperature ball milling of copper10.1016/j.jallcom.2017.07.029 ↗
30. Bonding technique using micro-scale silver oxide particles for in-situ formation of silver nanoparticles10.2320/matertrans.MRA2008269 ↗
31. Ultra-stable sintered silver die attach for demanding high-power/temperature applications10.1109/TDMR.2017.2737829 ↗
32. Self-diffusion in silver at low temperatures10.1002/pssb.2220570122 ↗
33. Evolution of pore morphology and distribution during the homogenization of direct chill cast Al-Mg alloys10.1016/j.actamat.2006.08.023 ↗