مراجعه Revision.

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Presentation transcript:

مراجعه Revision

محتويات امتحان الدورى الاول

lecture 1 تصنيف المواد الهندسىة? عرف هندسه و علم المواد? lecture 2 ?انواع الروابط الذرية ?قوة الرابطة و طاقة الرابطة

lecture 3 وحدة الخلية (Metallic Crystal Structure) التركيب البلورى للمواد المعدنية

Density Calculations – حساب الكثافة من أبعاد الخلية Atomic Packing Factor, (APF) معامل تزاحم الذرات Density Calculations – حساب الكثافة من أبعاد الخلية Polymorphism and Allotropy البولى مورفيزم و الالوثروبى

تمثيل المتجهات ارسم فى حاله متجه سالب ننقل نقطه الاصل خطوة موجبة فى اتجاه المحور السالب

تمثيل المستويات

العوامل التى تؤثر على الأنتشار ألية الأنتشار: (interstitial Diffusion) الأنتشار بالتداخل -2 العوامل التى تؤثر على الأنتشار

(b) Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion. (1) interstitial atoms, being smaller, are more mobile; and (2) the probability of an empty adjacent interstitial site is greater than for a vacancy adjacent to a host (or substitutional impurity) atom

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