the role of development microstructure and rapid solidification
- 2. Table of content ◦ Introduction of congruent melting point . ◦ Experiment ◦ discussion ◦ Results. ◦ Summary. ◦ . Introduction of congruent melting point . Experiment discussion Results Summary. 2
- 3. Introduction. ◦ Congruent melting - melting wherein a phase melts to a liquid with the same composition as the solid. 3
- 4. Why Ni3Ge adopted? ◦It is congruently melting B-tri nickel germanium compound with a purity range 22.5 to 25 at. 4
- 5. Experiment ◦ The process performed by dropped two method in which 6.5 metre drop tube height ◦ with 50 kilopascal a 9.5 gram of alloy is loaded into an alumina Crucible with a whole base the thin metal melt by induction furnace with graphite and RF coupling 5
- 6. ◦ The machine injects at 1480 Kelvin the powder was seived in two standard size from 800 to 38 micrometer particularly, 75 to 53 microns which is first interest 6
- 7. ◦ Main point ◦ The cooling rate can be estimated as a function of droplet size based on heat flux and Steven boltzman and glass transition temperature. ◦ The resulting pooling rate of four try nickel germanium is following 7 The graph shows if we increase the diameter of particle within single size fraction multiple rate appears
- 8. ◦ in this method the heat transfer can be determined while nucleation is stochastic this particular system evaluate cooling rates the main reason for the change in microstructures and other articles formed in tried to yet disorder growth. 8
- 9. ◦ In this dropped method microstructural as the data provides an evidence of spontaneous growth refinement but the crystallization ◦ In this method or you could have recrystallization do not suppressed with cooling rates add exceeds 42,000 Calvin per second in veg primary solidification is contracted seaweeds ◦ Undercooling prior to the nucleation is not possible . 9
- 10. ◦ Grain refinement will be superimposed upon underlying solidification morphology. Its impossible to exhibit recrystallization process during cooling ◦ In intermetallic if growth is faster so order lost. 10
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- 12. References ◦ Haque, N., Cochrane, R.F. and Mullis, A.M., 2017. The role of recrystallization in spontaneous grain refinement of rapidly solidified Ni3Ge. Metallurgical and Materials Transactions A, 48(11), pp.5424-5431 12
- 13. 13 Thanks! Any questions? You can find me at @hamzaahmed hamzaahmed0696@gmail.com