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ENHANCEMENT OF CUMULATIVE CORROSION-FATIGUE INTERACTION LIVES OF 6061-T6 ALUMINUM ALLOY USING ULTRASONIC IMPACT PEENING PROCESS

Authors: Hussain Jasem Mohammed Al-Alkawi --- Amer Hameed Majeed --- Saba Farhan Naser
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 4 Pages: 132-144
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The fatigue behavior of 6061-T6 aluminum alloy under constant and variable amplitude loading was investigated in air for as-received and pre-corroded specimens in 3.5% NaCl corrosive solution for 77 days. The experimental results presented that the tests of fatigue life on pre-corroded samples with and without ultrasonic peening revealed a significant reduction in life related with the presence of corrosion defects before cyclic loading. In state of unpeened specimens the constant S-N fatigue strength curve was decreased by 4.5% due to immersed the specimens in corrosive 3.5% NaCl solution for 77 days, while in state of ultrasonically peened specimens for 10 sec. per line and 2.5 joul energy the reduction of S-N curve decreased to 2.2% due to the beneficial effect of this treatment for increasing the corrosion-fatigue life. The improvement of fatigue life and corrosion-fatigue life of specimens when applying of ultrasonic peening was 8.69% for dry fatigue life and 2.3% for corrosion-fatigue interaction. The results of cumulative corrosion-fatigue tests indicated that the life of corroded specimens under the effect of ultrasonic peening treatment improved to approximately (3% ـــ 2.25%) for low-high and high-low sequences.


Article
Experimental Study on Tribological Characteristics of AA 6061 Alloy Reinforced with Al2O3 and B4C Particles
دراسة تجريبية للخصائص الترايبولوجية لسبيكةAA 6061 المقوّاة بدقائق Al2O3 و B4C

Authors: Khansa Daood AlShamari خنساء داوود الشمري --- Ihsan Kadhom AlNaimi إحسان كاظم عباس النعيمي --- Raad Hameed Majid رعد حميد ماجد
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2018 Volume: 24 Issue: 6 Pages: 1-10
Publisher: Baghdad University جامعة بغداد

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Abstract

Two different composite materials were prepared by stir casting method of AA 6061 alloy as a matrix reinforced with two addition different ceramic materials Al2O3 and B4C of grain size 20 µm by 2.5, 5, 7.5 and10% in weight. The composite material with aluminum alloy as a matrix possesses a unique mechanical properties such as: high specific strength and hardness, low density, and high resistance to corrosion and friction wear. This composite is widely used in automotive parts space and marine applications.Pin-on-disc technique was used to calculate the wear rate for each addition of Al2O3 and B4C particles. Rockwell hardness test and optical micrographs examinations were carried out to analyze, compare, and evaluate the addition of reinforced particles. The results of this investigation appeared that the 7.5% of ceramic particles addition give highest values of the hardness and wear resistance.

تم تحضير مادتين مركبة بطريقة السباكة بالمزج لسبيكة ألمُنيوم AA 6061 كمادة أساس مقوّاة بنوعين من الدقائق السيراميكية المضافة Al2O3 و B4C بحجم حبيبي 20 ميكرون وبنسبة وزنية 2.5، 5، 7.5 و 10%. تمتلك المادة المركبة من الألمُنيوم كمادة أساس خواص ميكانيكية فريدة مثل: مقاومة نوعية وصلادة عاليتين، كثافة منخفضة، ومقاومة عالية للتآكل، والتآكل الاحتكاكي. غالباً ما تستعمل هذه المواد المركبة في الفضاء، أجزاء السيارات، والتطبيقات البحرية. تقنية المسمار-على-القرص قد استخدمت لحساب نسبة معدل البلى لكل من الدقائق المضافة Al2O3 و B4C. اختبار روكويل للصلادة وفحص الصور المجهرية تم إجراؤها لتحليل، مقارنة، وتقييم إضافة الدقائق المقوّاة. نتائج هذا البحث أظهرت أن نسبة إضافة 7.5% من الدقائق السيراميكية أعطت قيم عالية للصلادة ومقاومة البلى.

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