Rapid solidification growth mode transitions in Al-Si alloys by dynamic transmission electron microscopy
Source abstract
Abstract
Abstract In situ dynamic transmission electron microscope (DTEM) imaging of Al-Si thin-film alloys was performed to investigate rapid solidification behavior. Solidification of alloys with compositions from 1 to 15 atomic percent Si was imaged during pulsed laser melting and subsequent solidification. Solely α-Al solidification was observed in Al-1Si and Al-3Si alloys, and solely kinetically modified eutectic growth was observed in Al-6Si and Al-9Si alloys. A transition in the solidification mode in eutectic and hypereutectic alloys (Al-12Si and Al-15Si) from nucleated α-Al dendrites at lower solidification velocities to planar eutectic growth at higher solidification velocities was observed, departing from trends previously seen in laser-track melting experiments. Comparisons of the growth modes and corresponding velocities are compared with previous solidification models, and implications regarding the models are discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Solidification and crystal growth phenomena · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (41)
Show source-provided references
1. Microstructural characterization of a rapidly-solidified Al-12wt% Si alloy10.1007/BF00356637 ↗
2. Evolution of microstructure in laser deposited Al–11.28% Si alloy10.1016/j.surfcoat.2011.09.051 ↗
3. Modification of eutectic silicon in Al–Si alloys10.1007/s10853-008-2505-5 ↗
4. Kurz · 1984
5. The coupled zone of rapidly solidified Al–Si alloys in laser treatment10.1016/0956-7151(92)90106-O ↗
6. The development of nucleation controlled microstructures during laser treatment of AlSi alloys10.1016/1359-6454(95)00393-2 ↗
7. Nucleation-controlled microstructural development in Al-Si alloys10.1016/S0921-5093(96)10612-2 ↗
8. Limit of steady-state lamellar eutectic growth10.1016/j.scriptamat.2011.01.010 ↗
9. Eutectic growth: a modification of the Jackson and Hunt theory10.1016/0956-7151(91)90114-G ↗
10. Theory of eutectic growth under rapid solidification conditions10.1016/0001-6160(87)90176-3 ↗
11. Solidification microstructures near the limit of absolute stability10.1007/BF02667594 ↗
12. Dendrite growth at the limit of stability: tip radius and spacing10.1016/0001-6160(81)90082-1 ↗
13. Three-dimensional multiscale modeling of dendritic spacing selection during Al-Si directional solidification10.1007/s11837-015-1444-2 ↗
14. Dendrite growth in eutectic alloys: the coupled zone10.1179/095066079790136408 ↗
15. About the banded structure in rapidly solidified dendritic and eutectic alloys10.1016/0956-7151(92)90076-Q ↗
16. X-ray imaging and controlled solidification of Al-Cu alloys toward microstructures by design10.1002/adem.201400469 ↗
17. Rapid solidification: in situ diagnostics and theoretical modelling10.1016/j.msea.2006.02.303 ↗
18. Single-shot dynamic transmission electron microscopy10.1063/1.2236263 ↗
19. Nanosecond time-resolved investigations using the in situ dynamic transmission electron microscope (DTEM)10.1016/j.ultramic.2008.03.013 ↗
20. Imaging of transient structures using nanosecond in situ TEM10.1126/science.1161517 ↗
21. Quantifying transient states in materials with the dynamic transmission electron microscope10.1093/jmicro/dfq032 ↗
22. Revealing the transient states of rapid solidification in aluminum thin films using ultrafast in situ transmission electron microscopy10.1080/09500839.2011.558030 ↗
23. Approaches to ultrafast imaging of transient materials processes in the transmission electron microscope10.1016/j.micron.2012.04.010 ↗
24. Irreversible reactions studied with nanosecond transmission electron microscopy movies: laser crystallization of phase change materials10.1063/1.4803921 ↗
25. In situ transmission electron microscopy of crystal growth-mode transitions during rapid solidification of a hypoeutectic Al-Cu alloy10.1016/j.actamat.2013.11.046 ↗
26. Quantitative phase analysis of rapid solidification products in Al-Cu alloys by automated crystal orientation mapping in the TEM10.1017/S1431927615008107 ↗
27. Movie-mode dynamic electron microscopy10.1557/mrs.2014.282 ↗
28. Time-resolved in situ measurements during rapid alloy solidification: experimental insight for additive manufacturing10.1007/s11837-015-1793-x ↗
29. Determination of crystal growth rates during rapid solidification of polycrystalline aluminum by nano-scale spatio-temporal resolution in situ transmission electron microscopy10.1063/1.4960443 ↗
30. Thermal conductivity and diffusivity of free-standing silicon nitride thin films10.1063/1.1145989 ↗
31. Specific heat and thermal conductivity of low-stress amorphous Si-N membranes10.1016/j.ssc.2003.08.048 ↗
32. Comparison of experimental, calculated and observed values for electrical and thermal conductivity of aluminium alloys10.1023/A:1018680024876 ↗
33. Laser processing of bulk Al-12Si alloy: influence of microstructure on thermal properties10.1080/14786435.2010.526650 ↗
34. Fisher · 1992
35. Theory of microstructural development during rapid solidification10.1016/0001-6160(86)90056-8 ↗
36. Structure and properties of aluminium-silicon eutectic alloys10.1016/0001-6160(72)90030-2 ↗
37. Growth structures in aluminum-silicon alloys I. The coupled zone10.1016/0022-0248(84)90084-8 ↗
38. Phase separation and undercooling in Al-Si eutectic alloy—the influence of freezing rate and temperature gradient10.1016/0001-6160(76)90102-4 ↗
39. Continuous model for interface motion during alloy solidification10.1016/0001-6160(88)90333-1 ↗
40. The Al-Si (Aluminum-Silicon) system10.1007/BF02868729 ↗
41. Boettinger · 1987