مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی اثر افزودن کلسیم و بور بر ریزساختار و خواص فشاری آلیاژ ریختگی منیزیم AZ91

نوع مقاله : پژوهشی اصیل

نویسندگان
علی یوسفی 1
بهمن کروجی 2
1 دانشگاه حکیم سبزواری
2 استادیار گروه مهندسی مواد و پلیمر دانشگاه حکیم سبزواری
10.52547/mme.22.8.497
چکیده
در این پژوهش اثر افزودن کلسیم و بور بر ریزساختار و خواص فشاری آلیاژ ریختگی منیزیم 91AZ مورد بررسی قرار گرفته است. در ابتدا به منظور تعیین مقدار مطلوب افزودن کلسیم از منظر کاهش اندازه دانه و حضور فازهای ثانویه به میزان 0.1 ،0.5 ،0.8 و 1 درصد وزنی کلسیم به آلیاژ 91AZ افزوده شد. بررسی های ریز ساختاری نشان داد که با افزودن 0.5 درصد وزنی کلسیم اندازه دانه از 105 به 65 میکرومتر کاهش یافته است بدون اینکه فاز Al2Ca ایجاد گردد. همچنین اثر مشابه ای بر روی فازهای مرزدانه ای در هنگام افزایش مقدار کلسیم افزودنی ملاحظه شد. سپس این آلیاژ با افزودن مقادیر 0.03، 0.09 و 0.12 درصد وزنی بور، به شکل آمیژانAlB3، از نظر ریزساختار ریختگی و خواص مکانیکی مورد ارزیابی قرار گرفت. نتایج نشان می­دهد که غلظت مطلوب بور، به منظور دستیابی به بالاترین میزان ریزدانگی، 0.09 درصد وزنی است. همچنین ارزیابی خواص فشاری نمونه های حاوی 0.5 در صد وزنی کلسیم و مقادیر مختلف بور نشان می دهد که آلیاژ دارای 0.09 درصد وزنی بور بهترین خواص فشاری را ارایه نموده است .
کلیدواژه‌ها
آلیاژ ریختگی منیزیم AZ91
ساختار ریختگی
خواص فشاری
کلسیم
بور

موضوعات

عنوان مقاله English

Effect of calcium and boron addition on the microstructure and compression properties of AZ91 cast magnesium alloy

نویسندگان English

Ali Yousefi 1
Bahman Korojy 2
1 materials and polymer engineering department, Hakim Sabzevari University
2 assistant professor , materials and polymer engineering department, Hakim Sabzevari University
چکیده English

In this study, the effect of calcium and boron addition has been investigated on the microstructure and compression properties of AZ91 alloy. Initially, in order to determine the optimal calcium amount to reduce the grain size and the presence of secondary phases, 0.1, 0.5, 0.8 and 1 weight percent of calcium were added to the AZ91 alloy. The microstructure evaluation showed that an increase of calcium up to 0.5wt. % decreased the average grain size from 105 μm to 65 μm without the formation of Al2Ca phase. The similar tendency on grain boundary phases are also observed when increasing quantity of Ca added. The microstructure and mechanical properties of the alloy was then evaluated by adding 0.03, 0.09 and 0.12wt. % B in the form of Al-3B master alloy. The results showed that the optimum concentration of boron is 0.09wt.% in order to achieve the lowest average grain size. In addition, the measured compression properties of samples containing 0.5wt. % calcium with different amounts of boron showed that the alloy with 0.9wt. % B presented the best mechanical properties.

کلیدواژه‌ها English

AZ91 cast magnesium alloy
Microstructure
Compression properties
Calcium
Boron
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مهندسی مکانیک مدرس
دوره 22، شماره 8
مرداد 1401
صفحه 497-508