Muddiest Point- Phase Diagrams II: Eutectic Microstructures

This screencast is the second part of our series about phase diagrams. This video is about eutectic-related microstructures and the issues student have with them.
To download the slide set from this video, visit this site: www.slideshare.net/mseasuslide...
To study the vocab used in this video, visit this site:
quizlet.com/20699445/52-eutect...
This work was supported by NSF Grants #0836041 and #1226325.

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@@junaidhussain4781 levers rule for phase fraction. you need to first understand what the structure might look like and then observe under a microscope

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[@natedrake3455]

voice is cute, the cool-down of hypoeut. part really helps a lot. thank you!

[@KLCII88]

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[@phivosaslanis2608]

Very good. Thank you for the video. Though, i would like to add that during extreme low cooling in order to theoretecally achieve thermal equillibrium, below the eutectic temperature and close to the left of the diagram (low B concetration), it is possible to have also a phase β percipitation from α phase, due to the solubility limit decrease with temperature decrease. So in total there will be α (proeutectic) + α + β (eutectic) + β (precipitated)

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[@junaidhussain4781]

Hi i need help, how it got phase fraction from these numbers, also how would you determine the material from microscope, can it have an shape like phase, also could information from strength can help us. Also what is alpha and beta

[@bennazhajamal3260]

First, I would like to thank you Professor for this pedagogic effort. After your permission, I would like to come back to the first cooling of the liquid C0 40. When we cool the liquid from 300°C to 225°C then 184°C we see from the diagram (Pb-Sn) that phase weight compo. is increasing in terms of Sn from 0.207 at 225°C to 0.502 at 184°C that explains the growing of the alpha crystals and the decreasing of the space occupied by the liquid. Furthermore, when following the curve on the left where we have alpha we can see that the comp of Sn increases when we come down to 184°C and at the sometime the Pb comp decreases in alpha. But in your interpretation professor you said that the crystals of alpha were rejecting Sn which is the contrary according to the latest remarks!!! For me, the alpha crystal should reject Pb instead of Sn because when we follow that part of the curve the comp of Sn increases and that of Pb decreases. The some remark can be made on the right of the diagram when you explain the beta formation. I will be so glad to know your reply to that and I would like to thank you for your efforts because I learnt a lot of details from you.

[@MarcelDupond75]

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[@junaidhussain4781]

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[@dyhawxyde7393]

Thanks that helped me to understand how grains react when the eutectic is forming !

[@junaidhussain4781]

Hi i need help, how it got phase fraction from these numbers, also how would you determine the material from microscope, can it have an shape like phase, also could information from strength can help us. What is eutectic

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[@cambomc7720]

I know these videos are super old but they are making this so much easier to understand. I have a quick question: Is the strength always the highest at the eutectic composition or is that only for this specific case where we are combining lead and tin to make solder? - Thanks in advanced if anyone can answer this.

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[@Raindeux]

Is there a video explaining how to find out the percent composition of primary alpha and the secondary alpha regions. Like how much of the total alpha is primary and how much is in the alternating platelets?

[@burakayan1429]

thank you for this helpfull video. may i ask what happens,for example a 40% sn 60% pb structure at 100 C degree. how does it seems ? again it is going to have alternating plates ? in terms of micro structre.

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[@ahmedkalaji7516]

can you please write why is the maximum strength at the eutectic composition ?

[@manuelsanchez9782]

Alternating platelets resist dislocation. The alpha and beta crystalline chunks don't have these alternating platelets that resist dislocation, therefore not having the alpha and beta crystalline chunks at the eutectic composition makes it the strongest composition since the only thing present would be the alternating platelets.

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Hi i need help, how it got phase fraction from these numbers, also how would you determine the material from microscope, can it have an shape like phase, also could information from strength can help us.

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[@rachelneale7614]

Can I get some more clarification on the phase weight fraction? What is it aka how is it different from the chemical composition and does it have a unit? and are all the single phases a phase weight fraction of 1?

[@MultiJuniork]

Is there a way of calculating primary alpha and/or primary beta composition and weigth percent composition?

[@AlanMW1996]

I think you would do it as if you were on the eutectic line

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SOOOO helpful!!

[@junaidhussain4781]

Hi i need help, how it got phase fraction from these numbers, also how would you determine the material from microscope, can it have an shape like phase, also could information from strength can help us.

[@serisingh]

@@junaidhussain4781 The phase fractions are determined using the lever rule. Many textbooks can explain the lever rule better than I if you need more information than this video provides. If the material and the phases that are expected to form are known, you can search literature for micrographs of each phase to help you identify the phases forming in your material. Different phases do have different strengths. You can use nanoindentation to gather hardness and (using an equation) strength data. But if the material is known, you can find already published data bout the hardness and strength of each phase present in the material.

[@vitobrabetz1146]

How much alpha is for example at T=182 and 40% Sn in the eutectic structure and how much is left for the alpha plates?

[@willTryAgainTmrw]

when we go from 2 to 3, the percentage of tin is increasing in both alpha and liquid. how is this possible? she said that alpha is kicking tin out, then how come the percentage of tin increased? yes i have understood how to find the percentage out, but question is different.

[@user-sw5le6zp8s]

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thx , great video

[@pooya130]

Hi, can atoms when in solid region move between different phases?

[@arwaabougharib8698]

Thanks for the lovely explanation! but I still don't get why the eutectic microstructure is stronger than the hypo- or hyper-eutectic ones, even though they have precipitates of primary alpha or beta ( which impede dislocation motion) in addition to the lamellar structure?

[@abhishekpariyar7895]

They do have lamellar Eutectic microstructure, but the dislocations can move easily in volumes where the proeutectic alpha and proeutectic beta are present in the hypoeutectic and hypereutectic compositions. I hope I have answered your question.

[@tyyy00]

plus the proeutectic phases act as stress concentrations. Theres a reason why you want them as circle rather than 'spears'

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[@andreahuerta687]

hey! quick question, In the hypoeutectic region, do the alpha crystals stay when the temperature keeps getting lower than the eutectic temperature?

[@profneilwalker]

Yes.

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