مهندسی متالورژی

مهندسی متالورژی

بررسی ریزساختار و خواص مکانیکی کامپوزیت زمینه تیتانیومی 2TiB Ti-ساخته‌شده به روش تف جوشی بدون فشار

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد، مهندسی مواد مرکب، دانشگاه صنعتی مالک اشتر، تهران، ایران.
2 دانشیار، مهندسی موادمرکب، دانشگاه صنعتی مالک اشتر، تهران، ایران.
چکیده
ساخت کامپوزیت‌های زمینه فلزی (MMC) با استفاده از فرآیند تف جوشی بدون فشار، روشی مناسب برای تولید قطعات با هزینه نسبتاً کم است. در این پژوهش ریزساختار و خواص مکانیکی کامپوزیت Ti-TiB موردبررسی قرارگرفته است.  تیتانیوم و کامپوزیت‌های زمینه تیتانیومی با 4، 8 و 12 درصد وزنی تقویت‌کننده 2TiB در آسیاب کم انرژی مخلوط و تحت‌فشار 500 مگاپاسکال به مدت 30 دقیقه پرس گرم شد، سپس با استفاده از روش تف جوشی بدون فشار در دمای1400 درجه سانتی‌گراد تحت جریان گاز آرگون به مدت 90 دقیقه تف جوشی شدند.
تغییرات ریزساختاری و خواص مکانیکی موردبررسی قرار گرفت. نتایج XRD و مشاهدات FESEM شکل‌گیری ویسکرهای درجا TiB را در نتیجه واکنش بین Ti و 2TiB تأیید می‌کند. خواص مکانیکی اندازه‌گیری شده نشان می‌دهد چگالی نمونه‌ها با به وجود آمدن ویسکر‌های درجا TiB  افزایش اما استحکام خمشی نمونه‌ها از 2294 مگاپاسکال به 994 مگاپاسکال کاهش می‌یابد.
همچنین سختی نمونه‌ها نیز بر اساس سختی ویکرز نیز اندازه‌گیری شد. کامپوزیت 2wt% TiB12Ti- بیشترین سختی را ارائه داد و سختی کامپوزیت با اضافه کردن12 درصد وزنی تقویت‌کننده حدود 127 درصد بیشتر از نمونه تیتانیوم خالص بود.
کلیدواژه‌ها

عنوان مقاله English

Investigation of Microstructure and Mechanical Properties of Titanium Matrix Composites Ti-TiB2 Made By Pressure less Sintering Method

نویسندگان English

sara sdat hashemi 1
Ali Alizadeh 2
1 M.Sc., Materials Engineering, Malik Ashtar University of Technology, Tehran, Department of Composite Materials, Tehran, Iran.
2 Associate Professor, Materials Engineering, Malik Ashtar University of Technology, Tehran, Department of Composite Materials, Tehran, Iran.
چکیده English

Manufacturing of metal matrix composites (MMCs) using the pressure less Sintering process is a suitable Method of producing parts with the lowest cost. In this study, the microstructure and mechanical properties of Ti-TiB composite were investigated. Titanium and titanium matrix composites were mixed with 4, 8 and 12 %wt reinforced in a ball mill and pressed under a pressure of 500 MPa for 30 minutes. Then, they were sintered under argon gas flow for 90 minutes using pressure less sintering at 1400 °C.
The microstructure and mechanical properties were investigated. XRD results and FESEM observations confirm the formation of TiB in-situ whiskers as a result of the reaction between Ti and TiB2. The measured mechanical properties show that the density of the specimens increase with the formation of TiB in-situ whiskeys, but the flexural bending of the samples, decreases from 2294 MPa to 994 MPa.
The hardness of the samples also was measured based on Vickers hardness. The Ti-12wt% TiB2 composite provided the highest hardness, and the hardness of the composite was about 127% higher than that of pure titanium by adding 12% by weight of reinforcement.

کلیدواژه‌ها English

Metal matrix
Pressure less Sintering
Mechanical Properties
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  • تاریخ دریافت 03 شهریور 1401
  • تاریخ بازنگری 29 مرداد 1402
  • تاریخ پذیرش 30 مرداد 1402