تأثیر دما بر مورفولوژی سطح شکست و انعطاف‌پذیری در شیشه‌فلز حجمی آلیاژ La55Al25Ni5Cu10Co5

نویسندگان

1 1. دانشکده فنی بخش مهندسی مواد و متالورژی، دانشگاه شهید باهنر، کرمان

2 2. دانشکده مهندسی و علم مواد، دانشگاه صنعتی شریف، تهران

چکیده

در این پژوهش، اثر دما بر اندازه متوسط مشخصه­ های سطح شکست و همچنین ارتباط بین مورفولوژی ­های سطح شکست و انعطاف ­پذیری شیشه ­فلز حجمی پایه لانتانیوم، که یک آلیاژ به‌نسبت ترد محسوب می­ شود، بررسی شده است. به‌همین منظور، پس از تهیه آلیاژ، نمونه­ های آماده شده در دماهای مختلف تحت آزمون خمش سه نقطه ­ای قرار گرفتند و سپس سطوح شکست آنها توسط میکروسکوپ الکترونی روبشی آنالیز شدند. نتایج نشان می ­دهد که عرض ناحیه رشد پایدار ترک (ΔW) با بهبود انعطاف­پذیری (δp < /sub>) افزایش می­یابد. در مقابل، اندازه متوسط مشخصه­ ها در دو ناحیه رشد پایدار ترک (Ds) و رشد سریع ترک (Df) و همچنین عرض پله برشی (ΔL) با افزایش انعطاف­پذیری کاهش می­ یابند که این حکایت از کاهش ناپایداری نوارهای برشی و توزیع یکنواخت ­تر کرنش مومسان روی نوارهای برشی دارد. یکسان بودن مقیاس  ΔLو Ds تأکید می­ کند که تشکیل طرح رگ ه­ای ناشی از رفتار لغزش چسبنده و چندمرحله ­ای در داخل نوار برشی از طریق ناپایداری انحنای جریان است. به ­علاوه، نتایج به ­دست آمده درخصوص ارتباط انعطاف­ پذیری و مورفولوژی سطح شکست شیشه ­فلز در دماهای مختلف بیانگر کاهش اندازه مشخصه ­ها با افزایش انعطاف­ پذیری است.
 

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Temperature on the Fracture Surface Morphology and Ductility of La55Al25Ni5Cu10Co5 BMG

نویسندگان [English]

  • M. T. Asadi Khanouki 1
  • R. Tavakoli 2
  • H. Aashuri 2
1 1. Department of Materials Engineering and Metallurgy, Shahid Bahonar University of Kerman, Kerman, Iran.
2 2. Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran.
چکیده [English]

In this research, the effect of temperature on the mean size of fracture surface features, as well as the relation between fracture surface morphologies and ductility of a La-based BMG as a relatively brittle alloy, was systematically investigated. After producing the alloy, three-point bending experiments, over a wide range of temperatures, were conducted on the samples; then the fracture surfaces were analyzed using scanning electron microscopy. The results demonstrated that the width of stable crack growth region (ΔW) was increased upon ductility (δp < /sub>). Conversely, the mean size of the features on both stable (Ds) and fast (Df) crack growth regions and also, shear offset width (ΔL) were found to decrease with increasing ductility. In this case, the shear band instability was reduced, and the plastic strain could be more homogeneously distributed on the shear bands. The similarity of ΔL and Ds values suggested that the formation of vein pattern was caused by steak-slip behavior and multiple-step sliding inside the shear band through the fluid meniscus instability mechanism. Furthermore, the results obtained from correlation between ductility and fracture surface morphologies in the BMG indicated that the size of features was reduced with increasing ductility.

کلیدواژه‌ها [English]

  • Bulk metallic glass
  • Shear band
  • Shear transformation zone
  • Fracture surface morphology
  • Ductility

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مواد پیشرفته در مهندسی
دوره 38، شماره 2
شهریور 1398
صفحه 11-24

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