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metagate.inPlatinum
Asked: April 14, 20202020-04-14T22:23:22+05:30 2020-04-14T22:23:22+05:30In: Physical Metallurgy & Heat treatment

BARC-2: Solid Aluminium has FCC Structure. It is melted to liquid (which is no crystal structure) and again cooled down slowly. How does Aluminium know that it has to solidify again as FCC? Why does it not solidify as BCC ?

BARC-2: Solid Aluminium has FCC Structure. It is melted to liquid (which is no crystal structure) and again cooled down slowly. How does Aluminium know that it has to solidify again as FCC? Why does it not solidify as BCC ?
BARC-2: Solid Aluminium has FCC Structure. It is melted to liquid (which is no crystal structure) and again cooled down slowly. How does Aluminium know that it has to solidify again as FCC? Why does it not solidify as BCC ?
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      Heisenberg Iron
      2020-04-14T22:42:03+05:30Added an answer on April 14, 2020 at 10:42 pm

      While solidifying from liquid state metal forms small clusters and these clusters can be in different crystal structure. But the crystal structure which have least lattice energy for that cluster of metal is stable and grow more while others dissociate back. In case of Al, FCC has less lattice energRead more

      While solidifying from liquid state metal forms small clusters and these clusters can be in different crystal structure. But the crystal structure which have least lattice energy for that cluster of metal is stable and grow more while others dissociate back.

      In case of Al, FCC has less lattice energy than BCC, thus it is more stable.

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    2. metagate.in Platinum GATE Metallurgy Coaching | Faculty with 7 years of Teaching Experience | 50% of Selections in all PSUs
      2020-04-15T13:20:08+05:30Added an answer on April 15, 2020 at 1:20 pm

      Even though Liquid has no structure it has short-range order. That is over a few lattice distances, crystal structures exist. Now coming to the Question of why FCC? If you take the same metal in different crystal structures like FCC, BCC, HCP... The structure which has the lowest Free Energy will beRead more

      Even though Liquid has no structure it has short-range order. That is over a few lattice distances, crystal structures exist.

      Now coming to the Question of why FCC? If you take the same metal in different crystal structures like FCC, BCC, HCP… The structure which has the lowest Free Energy will be stable.

      For Aluminium it turns out that the FCC structure is stable up to the melting point. Hence it solidifies as FCC

      For Metals like Fe & Ti…Allotropism is possible at different temperature ranges, and hence different structures are stable.

      I will continue my 3rd Question from here.

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      • Ivan Copper
        2020-04-27T11:00:04+05:30Replied to answer on April 27, 2020 at 11:00 am

        I agree for liquids we have short range order small clusters of original structure and it grows during solidification. Suppose when we cool from gaseous state the crystal structure remain same or different ? Justify your answer.

        I agree for liquids we have short range order small clusters of original structure and it grows during solidification.

        Suppose when we cool from gaseous state the crystal structure remain same or different ? Justify your answer.

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        • chiragsharmak
          2020-04-30T11:19:29+05:30Replied to answer on April 30, 2020 at 11:19 am

          In that case atoms don't have sufficient time to check for possible crystal stucture and redistribute itself into fcc crystal structure. Hence we ends up in amorphous glass structure region. But remember when i say fast it means it has to be super super fast to avoid any possible chance of crystal nRead more

          In that case atoms don’t have sufficient time to check for possible crystal stucture and redistribute itself into fcc crystal structure. Hence we ends up in amorphous glass structure region. But remember when i say fast it means it has to be super super fast to avoid any possible chance of crystal nucleation.

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    3. Vishal Pambhar Gold Metallurgist, Standard Provider (IS, ASTM, BS, ISO etc), Laboratory Equipment Suppliers,
      2020-04-14T23:26:36+05:30Added an answer on April 14, 2020 at 11:26 pm

      APF is important, the atomic packing factor, that is the reason FCC has more slip systems, because of the way the atoms are arranged in the crystal. Thus FCC metals deform easier than BCC metals and thus they are more ductile. BCC metals are infact stronger than FCC metals. While solidifying from liRead more

      APF is important, the atomic packing factor, that is the reason FCC has more slip systems, because of the way the atoms are arranged in the crystal. Thus FCC metals deform easier than BCC metals and thus they are more ductile. BCC metals are infact stronger than FCC metals.

      While solidifying from liquid state metal forms clusters which can be in different crystal structure. But the crystal structure which have Lower lattice energy for that cluster of metal is stable and grow more while others dissociate back.

      Al, FCC has less lattice energy than BCC,  which is more stable.

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    4. chiragsharmak
      2020-04-30T11:27:14+05:30Added an answer on April 30, 2020 at 11:27 am

      The using simulation (first principle calculation) it possible to find the free energy of aluminum in bcc, fcc, hcp phase. Once you get the output you will see that the fcc structure has lowing energy compared to other possible structure.  The entire calculation is based upon electronic interactionRead more

      The using simulation (first principle calculation) it possible to find the free energy of aluminum in bcc, fcc, hcp phase. Once you get the output you will see that the fcc structure has lowing energy compared to other possible structure.  The entire calculation is based upon electronic interaction of aluminium atoms with each other.

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    5. Chaitanya
      2020-04-14T22:36:24+05:30Added an answer on April 14, 2020 at 10:36 pm

      The FCC Al will have less lattice energy than Bcc Al . A system will always tries to form to its minimum energy configuration

      The FCC Al will have less lattice energy than Bcc Al . A system will always tries to form to its minimum energy configuration

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    6. Kathirvelan R Silver Learner
      2020-04-14T22:37:45+05:30Added an answer on April 14, 2020 at 10:37 pm

      Liquid has short range order. In this short range order small cluster are there. These cluster has fcc crystal structure because of lowest free energy compare to other crystal structure

      Liquid has short range order. In this short range order small cluster are there. These cluster has fcc crystal structure because of lowest free energy compare to other crystal structure

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    7. Chaithanyaa KG Iron
      2020-04-14T22:45:29+05:30Added an answer on April 14, 2020 at 10:45 pm

      Liquids have short range order

      Liquids have short range order

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    8. mahesh
      2020-04-14T22:45:38+05:30Added an answer on April 14, 2020 at 10:45 pm

      In liquids, Small groups are present which have short range order is called clusters. These liquid clusters will have the similar crystal structure of that of the solid. While solidifying these clusters grouped together to form a nuclei which is having FCC crystal structure.

      In liquids, Small groups are present which have short range order is called clusters. These liquid clusters will have the similar crystal structure of that of the solid. While solidifying these clusters grouped together to form a nuclei which is having FCC crystal structure.

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    9. Jyothi
      2020-04-14T22:49:19+05:30Added an answer on April 14, 2020 at 10:49 pm

      Fcc structure of Al has less free energy than bcc structure. Hence Al gets fcc structure after cooling

      • Fcc structure of Al has less free energy than bcc structure. Hence Al gets fcc structure after cooling
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    10. Ashutosh Potdar Iron
      2020-04-14T22:58:00+05:30Added an answer on April 14, 2020 at 10:58 pm

      During solidification, metals form clusters. These clusters exist because of short range orders in liquid. Clusters posses the crystal structure of least lattice energy because it is stable. Al have less lattice energy in FCC rather than in BCC. So it get backs to its crystal structure

      During solidification, metals form clusters. These clusters exist because of short range orders in liquid. Clusters posses the crystal structure of least lattice energy because it is stable. Al have less lattice energy in FCC rather than in BCC. So it get backs to its crystal structure

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    11. Dhivahar Iron
      2020-04-14T23:27:00+05:30Added an answer on April 14, 2020 at 11:27 pm
      This answer was edited.

      In liquid state of there will be clusters of atom having fcc crystal structure will be present.As the temperature approaches freezing point number of FCC clusters and no of atoms in clusters increases. The larger size clusters become nuclei when they attain a critical size.

      In liquid state of there will be clusters of atom having fcc crystal structure will be present.As the temperature approaches freezing point number of FCC clusters and no of atoms in clusters increases. The larger size clusters become nuclei when they attain a critical size.

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    12. Vijay Copper
      2020-04-14T23:56:09+05:30Added an answer on April 14, 2020 at 11:56 pm

      As everyone said that..  No of  physist botherd about what is the ground structure of a element or a component? Ground state must have low free energy to be stable. So FCC STRUCTURE posses low free energy then BCC ( IT IS ULTIMATELY FREE ENERGY)

      As everyone said that..  No of  physist botherd about what is the ground structure of a element or a component?

      Ground state must have low free energy to be stable.

      So FCC STRUCTURE posses low free energy then BCC

      ( IT IS ULTIMATELY FREE ENERGY)

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    13. Aneela Iron
      2020-04-29T14:34:00+05:30Added an answer on April 29, 2020 at 2:34 pm

      Liquid has short range order where the previous structure remains as small clusters all over the liquid. As Al is Fcc, it's liq has Fcc clusters in it and while solidification, those clusters grew attaining stability satisfying the conditions. So eventually attains it's Fcc

      Liquid has short range order where the previous structure remains as small clusters all over the liquid. As Al is Fcc, it’s liq has Fcc clusters in it and while solidification, those clusters grew attaining stability satisfying the conditions. So eventually attains it’s Fcc

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    14. Anonymous
      2020-05-07T13:50:28+05:30Added an answer on May 7, 2020 at 1:50 pm

      When the liquid aluminum cooled to lower temperatures, tiny solid clusters are formed in the liquid. These are formed in such a away that contains minimum free energy within the solid cluster, for aluminum, fcc has the lowest possible free energy than bcc or hcp. So these tiny solid clusters will grRead more

      When the liquid aluminum cooled to lower temperatures, tiny solid clusters are formed in the liquid. These are formed in such a away that contains minimum free energy within the solid cluster, for aluminum, fcc has the lowest possible free energy than bcc or hcp. So these tiny solid clusters will grow and turn into grains.

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    15. desetti sujatha
      2020-12-13T18:05:04+05:30Added an answer on December 13, 2020 at 6:05 pm

      Liquid has a short range order where small clusters have a periodic arrangement of atoms. These clusters can be of any crystal structure(FCC,BCC,HCP etc.). During solidification nucleation starts by formation of embryos(Clusters of atoms) which grows to critical size to become a nuclei. The clusterRead more

      Liquid has a short range order where small clusters have a periodic arrangement of atoms. These clusters can be of any crystal structure(FCC,BCC,HCP etc.). During solidification nucleation starts by formation of embryos(Clusters of atoms) which grows to critical size to become a nuclei. The cluster (FCC,BCC,HCP) which have a lowest free energy becomes stable and starts to grow to become a nuclei.

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    16. sp345
      2021-06-26T01:51:08+05:30Added an answer on June 26, 2021 at 1:51 am

      the reason is free energy. at temperatures lower than melting point the free energy of FCC phase is the lowest. so the liquid has to transform to FCC and not bcc

      the reason is free energy. at temperatures lower than melting point the free energy of FCC phase is the lowest. so the liquid has to transform to FCC and not bcc

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