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| 003 | EG-NbEJU | ||
| 005 | 20241204204328.0 | ||
| 008 | 241201b2024 ua | m||| 00| 0 eng d | ||
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_aEG-NbEJU _beng _cEG-NbEJU _dEG-NbEJU |
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| 041 |
_aeng _bara |
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| 050 |
_aMSE MSc. 2024 _b05 |
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| 100 | 1 | _aNyaforkpa , Godson , | |
| 245 | 1 | 0 |
_aLightweight Eutectic High Entropy Alloys as Phase Change Material for Thermal Energy Storage Applications : _bA thesis Submitted to the Graduate School of Innovative Design Engineering : Egypt -Japan University of Science and Technology (E-JUST) : in Partial Fulfillment of the Requirements for the Degree of Master of Science in Materials Science and Engineering / _cby Godson Nyaforkpa ; Supervisor Committee Prof. Mohammed Abdel-Hady Gepreel - MSE , E-JUST , Dr. Mohamed Emam - ERE , E-JUST ; Examination Committee Prof. Randa Abdelkarim - Cairo University - Faculty of Engineering , Prof. Mohammed Abdel-Hady Gepreel - MSE , E-JUST , Prof. Adel Amer - Suez University - Faculty of Petroleum and Mining Engineering |
| 246 | 1 | 5 |
_aسبائك عالية الانتروبي خفيفة الوزن و ذات تحول طوري ابوتكتيكي لتطبيقات تخزين الطاقة الحرارية : _bرسالة علمية مقدمة إلى المدرسة التخصصية للدرسات العليا - هندسة التصميم الابداعي : الجامعة المصرية اليابانية للعلوم و التكنولوجيا كاستيفاء جزئي لمتطلبات الحصول على درجة (ماجستير العلوم) في هندسة و علوم المواد / إعداد جودسون نيافوركابا ; لجنة الاشراف على الرسالة أ . د . محمد عبدالهادي جبريل - الجامعة المصرية اليابانية للعلوم و التكنولوجيا , د . محمد السيد امام - الجامعة المصرية اليابانية للعلوم و التكنولوجيا ; لجنة المناقشة والحكم على الرسالة أ . د . رندا عبدالكريم - كلية الهندسة - جامعة القاهرة , أ . د . محمد عبدالهادي جبريل - الجامعة المصرية اليابانية للعلوم و التكنولوجيا , أ . د . عادل عامر - كلية هندسة البترول و التعدين - جامعة السويس |
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_aAlexandria : _bGodson Nyaforkpa _c2024 |
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| 300 |
_aleaves ; _c30 cm |
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| 500 | _aIncludes a title page in Arabic | ||
| 502 |
_aThesis (M.Sc.) _bMaster _cEgypt - Japan University of Science and Technology (E-JUST) - School of Innovative Design Engineering - Materials Science and Engineering Department _d2024 |
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| 504 | _aIncludes bibliographical references | ||
| 520 | _aContinuous research into innovative lightweight eutectic high entropy alloys has attracted the attention of numerous researchers This study investigates the thermophysical properties , thermal cyclability and conductivity of new lightweight eutectic high entropy alloys for usage as a phase change material in thermal energy storage applications The major requirements of Phase Change Materials (PCM) include high latent heat of fusion , long-term chemical stability , economic feasibility , no significant change in volume of the storage unit , and desired temperature range Four alloys were designed using the the thermodynamics parameters ; namely , AlMgZnCuSim , AlMgZCS AlMgZnisCuSis and AlMgZnsCusSis alloy with a balance between intermetallic and eutectics were produced to target energy storage as phase change materials The alloys were produced using two different subsequent melting processes First , Al-Cu-Si temary alloy with non-equiatomic composition was prepared using an (ARCAST 200 , ME , USA) electric arc melting furnace The raw materials were with purities greater than 99.9% and underwent three melting cycles to achieve homogeneity After are melting , the ingot , together with Zn and Mg with a purity level greater than 99.9%, was placed into a graphite crucible inside a stainless-steel reactor closed in an argon-protective atmosphere to prevent the presence of oxygen during the melting process The reactor was positioned within an electric muffle furnace and held at 750°C for 7 hours followed by a semisolid forging process conducted at 510°C , to investigate the behavior and phase transformations associated with this alloy The semisolid forging process demonstrated remarkable plasticity , significantly reducing sample thickness by 35% and 70%, respectively compared to the as-cast samples Also , with an increase in forging from the as-cast sample to a 70% reduction , the oxidation rate decreases during cyclic heating - cooling of the sample The alloy also exhibited an exceptional latent heat capacity of up to 168.9 kJ/kg ranking among the highest values reported for high-temperature metallic phase change materials The experimental and the theoretical computed specific heat capacity (Cp) of the alloy demonstrates a high degree of congruence with experimental data of other metallic thermal energy storage materials The oxidation kinetics showed an increasing pattern of weight change , adhering to a parabolic rate law The semisolid sample , which was 70% oxidized , displayed the lowest parabolic rate constant of 0.233 * 10 g/cm² after 500 minutes indicating a low oxidation rate , thus having good oxidation resistance Also , the thermal stability of the alloy has increased by applying more reduction | ||
| 530 | _aIssued also as a digital file (for more information please check our Digital Repository) | ||
| 590 |
_aAnD _bACM |
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| 700 | 1 |
_aGepreel , Mohammed Abdel-Hady , _eSupervisor |
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| 700 | 1 |
_aEmam , Mohamed , _eco-Supervisor |
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| 700 | 1 |
_aAbdelkarim , Randa , _eExaminator |
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| 700 | 1 |
_aGepreel , Mohammed Abdel-Hady , _eco-Examinator |
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| 700 | 1 |
_aAmer , Adel , _eco-Examinator |
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| 700 | 1 |
_aجبريل , محمد عبدالهادي , _eمشرف |
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| 700 | 1 |
_aامام , محمد السيد , _eمشرف مساعد |
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| 700 | 1 |
_aعبدالكريم , رندا , _eمناقش |
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| 700 | 1 |
_aجبريل , محمد عبدالهادي , _eمناقش مساعد |
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| 700 | 1 |
_aعامر , عادل , _eمناقش مساعد |
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| 856 |
_u7081 _yURI |
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| 901 | _aHaGeR | ||
| 902 | _aTH_01122024_ (2) | ||
| 942 |
_2lcc _n0 _cDISS |
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| 999 |
_c7081 _d7081 |
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