The CsCl-type order-disorder transition temperature in VMn alloys

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書誌事項

公開日
1975-01
権利情報
  • https://www.springernature.com/gp/researchers/text-and-data-mining
  • https://www.springernature.com/gp/researchers/text-and-data-mining
DOI
  • 10.1007/bf02673706
公開者
Springer Science and Business Media LLC

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説明

of the g rea t e r ra te of heat ex t rac t ion f rom the bulk l iquid (posit ion E 2 o n Fig. 2). This in t u rn will s t i l l fu r the r dec rea se the growth ra te of the co lumnar in t e r face and i n c r e a s e the t e m p e r a t u r e grad ien t and hence dec rea se the t e m p e r a t u r e of the co lumnar f ront (posit ion C4, Fig. 2). The r a t e s of growth and t e m p e r a t u re s of the co lumnar and equiaxed c ry s t a l s will t h e r e fore follow the a r rows shown on Fig. 2. The growth ra te of the equiaxed c r y s t a l s rap id ly i n c r e a s e s and the growth ra te of the co lumnar in te r face d e c r e a s e s . Eventua l ly a condit ion is r eached where the co lumnar f ront has a lmos t stopped but where the equiaxed c ry s t a l s a re growing rapidly . This phenomena leads to the v e r y abrupt change in s t r u c t u r e observed in many cas t ings and ingots. It is much more difficult to envisage such an abrupt change if the effect of g rad ien t ahead of the co lumnar f ront is neglected.

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