مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ریز ساختار و خواص مکانیکی لوله های آلیاژ منیزیم AZ91 فرآوری شده با روش جدید انبساط و اکستروژن تناوبی بهبود یافته

نوع مقاله : پژوهشی اصیل

نویسندگان
میلاد عالی مجید آباد
محمد افتخاری
قادر فرجی
دانشگاه تهران
10.22034/mme.23.9.511
چکیده
برای در پژوهش حاضر، یک فرآیند تغییر شکل پلاستیک شدید بهبود یافته­ به نام فرآیند انبساط و اکستروژن تناوبی بهبود یافته معرفی شده است. ایده­ی فرآیند مذکور از فرآیند سنتی انبساط و اکستروژن تناوبی لوله گرفته شده و در طراحی آن تلاش شده است تا برخی از مشکلات مهم فرآیند سنتی مرتفع گردد. فرآیند انبساط و اکستروژن تناوبی بهبود یافته، قابلیت تغییرشکل پلاستیک شدید و بهبود ریزساختار و خواص مکانیکی قطعات لوله­ای شکل را دارد. همچنین، این فرآیند در تولید لوله­هایی با طول نسبتاً بلند می­تواند مورد توجه قرار گیرد. در این پژوهش، فرآیند انبساط و اکستروژن تناوبی بهبود یافته با موفقیت طی دو پاس بر روی لوله‌هایی از جنس آلیاژ منیزیم AZ91 اجرا گردید. سپس، تکامل ریزساختاری و بهبود خواص مکانیکی مورد بررسی قرار گرفت. نتایج حاکی از آن بود که ریزساختار و خواص مکانیکی، بهبود قابل‌توجهی یافته است. در این راستا، پس از انجام دو پاس فرآیند، ساختاری فوق ریزدانه تشکیل شد و مقادیر استحکام نهایی، سختی و داکتیلیتی به ترتیب 6/3، 83/1 و 8/1 برابر گردید. همچنین، مقایسه نتایج حاصل از فرآیند انبساط و اکستروژن تناوبی بهبود یافته با نتایج فرآیند سنتی انبساط و اکستروژن تناوبی لوله نشان داد که مقادیر استحکام نهایی و سختی حاصل از فرآیند بهبود یافته به مقادیر حاصل از فرآیند سنتی نزدیک بوده ولی مقدار ازدیاد طول شکست حاصل از فرآیند بهبود یافته به طرز قابل توجهی بیشتر از فرآیند سنتی می­باشد که می­توان آن را به عنوان یکی از مزایای مهم فرآیند بهبود یافته نسبت به فرآیند سنتی در نظر گرفت
کلیدواژه‌ها
تغییر شکل پلاستیک شدید
لوله
آلیاژ AZ91
فوق ریزدانه
خواص مکانیکی

موضوعات

عنوان مقاله English

Microstructure and Mechanical Properties of AZ91 Magnesium Alloy Tubes Processed by New Method of Improved Tube Cyclic Expansion Extrusion

نویسندگان English

Milad Aali
Mohammad Eftekhari
Ghader Faraji
University of Tehran
چکیده English

In present study, an improved severe plastic deformation process named improved tube cyclic expansion extrusion process has been introduced. The idea of this process is taken from the conventional tube cyclic expansion extrusion process, and in this novel process, it is tried to solve some important problems of the conventional process. Improved tube cyclic expansion extrusion process is capable of severe plastic deforming and improving microstructure and mechanical properties of tubular components. Also, this process can be considered for producing relatively long tubes. For this purpose, the improved tube cyclic expansion extrusion process was successfully performed on AZ91 magnesium alloy tubes, up to two passes. Then, the microstructure evolution and the mechanical properties improvement were scrutinized. The results showed that the microstructure and mechanical properties were improved considerably. In this way, after two passes of this process, an ultrafine grained (UFG) microstructure was formed, and the values of ultimate strength (UTS), hardness (Hv) and ductility (EL%) became 3.6, 1.83 and 1.8 times higher, respectively. Also, the comparison of the results of the improved tube cyclic expansion extrusion process with those of the conventional tube cyclic expansion extrusion process indicated that ultimate strength and hardness of the improved process were near to those of the conventional process, but the value of elongation to failure of the improved process is considerably higher than the value of the conventional process. This can be considered as one of the important advantages of the improved process over the conventional process.

کلیدواژه‌ها English

Severe plastic deformation
Tube
AZ91 alloy
Ultra-fine grained
Mechanical properties
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مهندسی مکانیک مدرس
دوره 23، شماره 9
شهریور 1402
صفحه 511-519