مشاركة
تاثير اضافة عنصر النيكل الى سبيكة Al - 4% Cu - 1.5% Mg == The Effect of Ni Addition To Al - 4 % Cu - 1.5% Mg Alloy
اسم المؤلف:
اسيل احمد اموري
اسم المشرف:
منذر محمد راضي
الموضوع العام:
هندسة الانتاج والمعادن والمواد
السنة:
2008
الموضوع الدقيق:
هندسة المعادن
الدرجة:
ماجستير
الجامعة:
الجامعة التكنولوجية
اللغة:
العربية
مكان الجامعة:
بغداد
الصفحات الاولى:
50T180 - p.pdf
المستخلص:
في هذا البحث تم دراسة تاثير اضافة عنصر النيكل النقي وبنسب مختلفة (wt % 5 - 3 - 2 - 1) الى منصهر سبيكة المنيوم - نحاس - مغنيسيوم وتمت سباكتها بوساطة السباكة بالقوالب المعدنية ومن ثم اجراء المعاملة الحرارية التي شملت (عملية التجانس الحراري على السبائك بعدها | The studying effect of adding pure nickel element in different percentages to (Aluminum - 4%Copper - 1.5%Magnesium) during alloy molten state by die casting procedure, and then make the heat treatment that includes : (the thermal homogenizing followed by heat treatment (T6) which includes solution treatment followed by artificial aging at 220 C? at different times within the range (30 min. - 5 hr.)). Also had been studied the effect of pure nickel element on microstructure and on grain size and the types of phase that created in alloys produced by founding by using optical microscope , x - ray diffraction test device and a program that calculates the volume fraction of particles (J - image). So when we tested the hardness, the result showed that the alloy with highest adding rate (5% wt) have the best response between other alloys for hardening in longer time period and we reached to highest hardness (125 H.V) in time period (4hr) at (220 C?). While the alloy that doesn't have nickel reached to highest hardness equal to (112 H.V) in time period less than (2hr). The phases that created in alloys had been listed through analysis the x - ray diffraction and study the microstructure; we found the phase (Al7Cu4Ni) that be responsible on showing in alloy's response to precipitation hardening which leads to delay, also we found that the adding of nickel causes increase and improve in properties of tensile strength, yield strength and elongation, this is belong to presence of nickel that takes two ways, a part of it dissolves with Aluminum and copper and produce the phase (Al7Cu4Ni) which slows producing the phase (Al2CuMg), and other part refining grains size at highest temperature degrees that leads to increase in strength and hardness with higher rates for alloys contain nickel in comparison to those empty of nickel.
