ارتقای سختی آلیاژ هوایی تیتانیوم Ti-6Al-4V با پوشش کامپوزیتی ایجاد شده به روش جوشکاری TIG

نویسندگان

گروه مواد، دانشکده مکانیک، دانشگاه پدافند هوایی خاتم‌الانبیاء(ص) گروه مواد، دانشکده مکانیک، دانشگاه صنعتی نوشیروانی بابل

چکیده

آلیاژ تیتانیومTi-6Al-4V  به­دلیل دارا بودن خواصی نظیر نسبت استحکام به وزن زیاد و مقاومت به خوردگی دارای کاربردهای مهمی در صنایع هوافضا است. در مقابل، این آلیاژ مقاومت به سایش ضعیفی به­ویژه تحت بارهای زیاد نشان می­دهد. در این مقاله، با هدف بهبود سختی و در نتیجه افزایش مقاومت سایشی آلیاژTi-6Al-4V ، ذرات سرامیکی و بسیار سخت B4C به حوضچه مذاب در فرآیند جوشکاری TIG، افزوده شد. بررسی­های میکروساختاری با روش­های پراش اشعه ایکس و میکروسکوپ الکترونی روبشی نشان داد که ذرات کاربید بور تقریباً به­طور کامل در زمینه تیتانیومی حل شده و با ورود بور و کربن به مذاب تیتانیوم و واکنش با آن، فازهای بر مبنای TiB و TiC تشکیل شدند. مورفولوژی­های فاز بر مبنای TiB به دو صورت تیغه­ای و یوتکتیک­شکل و فاز بر مبنای TiC کروی­مانند بود. نتایج نشان داد که مقدار سختی سطحی ایجاد شده، به مقدار 1020 ویکرز رسید که حدود 3 برابر بیشتر از آلیاژ پایه بود.

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