بررسی رفتار شکست نمونه های کامپوزیتی زمینه آمورف حجمی (Zr55Cu30Al10Ni5)100-xNbx با تقویت کننده سیم تنگستن، حین آزمون فشار تک محوری

نوع مقاله : علمی و پژوهشی

نویسندگان

• مرتضی محمودان ¹
• رضا غلامی پور ²
• شمس الدین میردامادی ³
• سعید ناطق ³

¹ ازاد اسلامی

² سازمان پژوهشهای علمی و صنعتی ایران

³ آزاد اسلامی

10.22067/ma.v30i1.58225

چکیده

کامپوزیت‌های(Zr55Cu30Al10Ni5)100-xNb(x= 0, 2)   W/به روش فلزخورانی در دمای 950 درجه سانتیگراد به مدت 15 دقیقه تولید شدند. خواص ساختاری و مکانیکی کامپوزیت‌های تولید شده با این روش، به ترتیب توسط میکروسکوپ الکترونی روبشی و آزمون فشار تک محوری مورد بررسی قرار گرفتند. بر اساس نتایج حاصل از خواص مکانیکی و ریزساختاری، در نمونه X=2، سطح شکست عمدتا از نوع سطح شکست رگه ای بوده و با افزایش میزان چگالی ساختارهای رگه ای، شکل پذیری پلاستیک نیز به 28 درصد افزایش یافت. همچنین در نمونه بدون افزودنی نیوبیم، فازهای بین فلزی ثانویه W2Zr) و (W5Zr3 (که خود از محل‌های جوانه زنی ترک هستند) به عنوان مکان‌های تمرکز تنش عمل کرده و سطح شکست در این نمونه کامپوزیتی عمدتا از نوع مسطح بوده و با تبدیل سریع باندهای برشی به ترک، شکل پذیری پلاستیک کامپوزیت کاهش یافت.

کلیدواژه‌ها

• کامپوزیت
• آمورف حجمی
• شکست

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عنوان مقاله [English]

Investigation of Failure Behavior of W/ (Zr55Cu30Al10Ni5)100-xNbx Composites during Compression Test

نویسندگان [English]

• Morteza Mahmoodan ¹
• reza gholamipour ²
• Shamseddin Mirdamadi ³
• saeed Nategh ³

¹ Azad

² Irost

³ Azad

چکیده [English]

(Zr55Cu30Al10Ni5)100-xNb(x= 0, 2) bulk metallic glass matrix/tungsten wire composites were fabricated by infiltration process at 950 ◦C and 15 minute processing time. Structural studies and mechanical behaviors of the materials were investigated by scanning electron microscopy and compressive tests, respectively. Based on the results, the fracture surface in the composite sample with X=2 was vein like pattern and with increase of the vein's intensity in the matrix, the ductility reached 28%. In the niobium-free composite sample the secondary intermetallic phases of (W2Zr , W5Zr3) (as the crack nucleation sites) act as the stress concentration sites and the fracture surface changed to smooth mode. In addition, the composite ductility was reduced because of the rapid convection of shear bands to cracks.

کلیدواژه‌ها [English]

• Composite
• bulk amorphous
• Fracture

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