* Thermal Equilibrium Diagrams is one of the metallurgists most important "tools" with its aid one can find precisely what the structure of a given alloy will be at any given temperature, provided that the alloy has been allowed to reach equilibrium. In the metallurgical sense, " equilibrium", refers to the state of balance which exists between the phases in the structure of any alloy after a chemical or physical change has taken place.
* When a pure liquid solidifies into a crystalline solid, it does at a fixed temperature called the freezing point. During the crystallization process the atoms assume positions according to some geometrical pattern, and whilst this is taking place, the latent heat of solidification is given out without any fall in temperature taking place. A typical cooling curve for a pure metal is shown in Fig1.
Type -1- Two metals completely soluble in the liquid and solid states.
* When an alloy solidify, it does over a range of temperature which will depend upon the composition of the alloy. Consider, for example, a number of alloy of different composition, containing the two metals A and B which form a series of solid solutions (see Fig.2)
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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