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5 result(s) for "Alsowidy, Shakib"
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Effects of Al3Ni compound on localized plastic deformation and creep strain of Al/Si hypoeutectic material
The mechanical resistance of AS10/xNi hypoeutectic alloy with (x = 0.05% and 0.1%) has been investigated. Vickers hardness (HV) was determined for the samples before and after sintering. All samples were subjected to a compressive creep test at a constant temperature of 298 K and a constant load of 45 MPa. Creep parameters, such as creep rate, sensitivity (m), time exponent (n), β, and ɣ have been calculated and related to the Ni content. Microstructure investigation was conducted using the scanning electron microscope technique (SEMT). After sintering, the results showed that there was a significant improvement in the hardness with the addition of nickel. There is an increase in creep resistance as a result of the distribution of Al 3 Ni chemical compound across grain boundaries, which stops additional dislocation movement and hence reduces the creep rate.
Influence of Nickel Percentage on Lattice Structure and Mechanical Strength in Al‐Si Alloy
Aluminum alloys play a crucial role in various industrial applications due to their low weight and favorable mechanical properties. The specific mechanical properties of aluminum alloys can be tailored through alloying and heat treatment processes to meet the requirements of different applications. This study focused on investigating the impact of Ni addition at different concentrations (0, 0.01, 0.05, and 0.1 wt. %) on the microstructure and mechanical strength of Al‐Si alloy. The evaluation was performed using X‐ray diffraction (XRD) and Vickers hardness (HV) tests. XRD analyses revealed that the Al‐Si alloy consisted of α ‐Al and Si phases. Upon the addition of Ni, an intermetallic compound (IMC), Al 3 Ni, was identified. The presence of this IMC leads to changes in the lattice constant and interatomic spacing (d hkl ). Vickers hardness (HV) measurements were performed on the samples before and after sintering. The results indicated that the highest hardness value obtained was 93 HV for the sample containing 0.1 wt.% Ni after sintering, whereas the lowest hardness value was 56 Hv for the sample without any nickel content before sintering. This increase in hardness can be attributed to the elevated temperature, which facilitated greater diffusion of nickel atoms into the aluminum lattice.
Effects of Al 3 Ni compound on localized plastic deformation and creep strain of Al/Si hypoeutectic material
The mechanical resistance of AS10/xNi hypoeutectic alloy with (x = 0.05% and 0.1%) has been investigated. Vickers hardness (HV) was determined for the samples before and after sintering. All samples were subjected to a compressive creep test at a constant temperature of 298 K and a constant load of 45 MPa. Creep parameters, such as creep rate, sensitivity (m), time exponent (n), β, and ɣ have been calculated and related to the Ni content. Microstructure investigation was conducted using the scanning electron microscope technique (SEMT). After sintering, the results showed that there was a significant improvement in the hardness with the addition of nickel. There is an increase in creep resistance as a result of the distribution of Al Ni chemical compound across grain boundaries, which stops additional dislocation movement and hence reduces the creep rate.
Silver(Ag) Improvements on The Structural, Creep Resistance and Electrical Conductivity Properties of Eutectic Sn-9Zn Alloy
قيست الخواص التركيبية ومقاومة الزحف والموصلية الكهربائية لسبائك (قصدير-9 خارصين) مع إضافة الفضة بتراكيز (0.1 & 0.3 wt.%) باستخدام جهاز حيود الأشعة السينية وجهاز اختبار الزحف الميكانيكي ودائرة التيار المستمر، على التوالي. تم تحضير الثلاث العينات بنقاوة عالية (99.99%) باستخدام تقنية الصهر في أنابيب بيركس مع إضافة كلوريد الكالسيوم لمنع التأكسد. أظهرت تحاليل جهاز حيود الأشعة السينية للسبيكة الثنائية (قصدير-9 خارصين) أنها مركب ابتدائي من طورين، الأول طور رباعي متمركز الجسم β-Sn والثاني طور خارصين سداسي، بينما مع إضافة الفضة للسبيكة الثنائية أظهرت أنماط حيود الأشعة السينية قمم جديدة في المركبات الثلاثية مثل (Ag3Sn & AgZn3) β-Sn, Zn, متوسط الحجم الحبيبي للطور (β-Sn) يتناقص مع زيادة إضافة الفضة بينما كثافة الانخلاع تتزايد مع زيادة إضافة الفضة. خصائص الزحف دٌرست للثلاث العينات عند درجات حرارة مختلفة (25، 40، و 80 درجة مئوية) تحت تأثير حملين (18.7 و 24.9 ميجا باسكال). أظهرت نتائج سلوك الزحف لسبائك أن السبائك الثلاثية لها مقاومة زحف أعلى من السبيكة الثنائية، بسبب تعزيز التركيب وظهور مركبات بينية في السبائك. تم الحصول على قيم أس الإجهاد في نطاق 2.51 إلى 6.68 لجميع السبائك. تم الحصول على قيم طاقة التنشيط للسبائك في حدود 36.48 إلى 41.14 كيلو جول/مول للحمل 18.7 ميجا باسكال و 27 إلى 34.3 كيلو جول / مول للحمل 24.94 ميجا باسكال. الموصلية الكهربائية قيست عند درجة حرارة الغرفة (25 درجة مئوية)، قيمها تزايدت مع زيادة إضافة تركيز الفضة.