مهندسی متالورژی

مهندسی متالورژی

بررسی خواص مکانیکی و ریزساختاری نانوکامپوزیت AZ31/GO تولید شده با استفاده از فرایند اصطکاکی

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشگاه علم و صنعت ایران
چکیده
در این پژوهش آلیاژ AZ31 و یک نانو کامپوزیت با زمینه‌ی آلیاژ مذکور همراه با ذرات تقویت کننده‌ی اکسید گرافن، تحت فرایند اصطکاک همزنی قرار داده شدند و خواص مکانیکی و ریزساختاری آن‌ها با یکدیگر مقایسه شدند. فرایند اصطکاک همزنی تحت سرعت پیشروی ثابت 85 میلی متر بر دقیقه و سرعت‌های دوران 1180 و 1500 دور بر دقیقه و قطر شانه 12 (12D) و 16 (16D) میلی‌متر انجام شد. اندازه دانه در نمونه‌ تحت فرایند اصطکاکی همزنی شده و نانوکامپوزیتی از 80 میکرومتر به ترتیب به حدود 5/3 و 7/3 میکرومتر رسید. سختی در نمونه‌های تحت فرایند اصطکاکی همزنی قرار گرفته در حدود 36 درصد و در نمونه‌های کامپوزیتی در حدود 28 درصد افزایش پیدا کرد که این افزایش سختی را می‌توان به ریزدانه شدن از طریق تبلور مجدد دینامیکی، پین شدن مرزها توسط ذرات فاز ثانویه و ذرات تقویت کننده و جلوگیری از صعود نابجایی‌ها توسط ذرات تقویت کننده نسبت داد. مشاهدات ریزساختاری نشان داد که افزایش سرعت دوران و قطر شانه باعث توزیع همگن و یکنواخت اکسید گرافن در ریزساختار می‌شود. همچنین فرایند اصطکاکی همزنی از طریق تبلور مجدد دینامیکی باعث ایجاد دانه‌هایی همگن و هم‌محور می‌شود. آزمون تست کشش با نرخ کرنش 05/0 برثانیه انجام شد. ازدیاد طول و استحکام کششی نهایی در نمونه‌ تحت فرایند اصطکاکی همزنی قرار گرفته و نانوکامپوزیتی با قطر شانه 12 میلی متر از 082/38 و 8686/212 مگاپاسکال به ترتیب به 5/37، 9484/246، 74/31 و 0776/257 مگاپاسکال رسید.
کلیدواژه‌ها

عنوان مقاله English

Investigation of microstructural and mechanical properties of AZ31/GO nanocomposite produced by friction stir

نویسندگان English

Zoleikha Karimi
Hamidreza Jafarian
Mohamad taghi Salehi
Alireza eivani
Iran University of Science and Technology,
چکیده English

In this research, AZ31 alloy and AZ31 alloy reinforced with graphene oxide particles (i.e., AZ31-GO nanocomposite) were subjected to friction stir processing (FSP) and their microstructure and mechanical properties were compared. The FSP process was carried out under a constant advance speed of 85 mm/min, rotation speeds of 1180 and 1500 rpm, and shoulder diameters of 12 and 16 mm. After applying the FSP process, the grain size in the AZ31 and AZ31-GO nanocomposite samples reached from 80 micrometers to about 3.5 and 3.7 micron, respectively. Hardness in FSP samples increased by about 36% and in composite samples by about 28%, which increase in hardness can be attributed to fine graining through dynamic recrystallization, pinning of boundaries by secondary phase particles and reinforcement particles and prevention of dislocations climbing by reinforcing particles. Microstructural observations showed that increasing the rotation speed and shoulder diameter causes a homogeneous and uniform distribution of graphene oxide in the microstructure. The tensile test was performed with a strain rate of 0.05s-1. Elongation and UTS in FSP and nanocomposite sample with 12 mm shoulder diameter reached from 38.082 and 212.8686 MPa to 37.5 %, 246.9484 MPa, and 31.74 %, 257.0776 MPa, respectively.

کلیدواژه‌ها English

Carbon nanotube
Twinning
Nano composite
Mechanical properties
[1] Froes FH, Eliezer D, Aghion E. The science, technology, and applications of magnesium. JOM. 1998 Sep 1;50(9):30–4.
[2] Zhou T, Yang M, Zhou Z, Hu J, Chen Z. Microstructure and mechanical properties of rapidly solidified/powder metallurgy Mg–6Zn and Mg–6Zn–5Ca at room and elevated temperatures. Journal of Alloys and Compounds. 2013 Feb 5; 560:161–6.
[3] Mironov S, Onuma T, Sato YS, Yoneyama S, Kokawa H. Tensile behavior of friction-stir welded AZ31 magnesium alloy. Materials Science and Engineering A. 2016 Oct 16; 679:272–81.
[4] Mironov S, Onuma T, Sato YS, Kokawa H. Microstructure evolution during friction-stir welding of AZ31 magnesium alloy. Acta Materialia. 2015 Sep 5; 100:301–12.
[5] Bagheri B, Abbasi M, Abdollahzadeh A. Microstructure and mechanical characteristics of AA6061-T6 joints produced by friction stir welding, friction stir vibration welding and tungsten inert gas welding: A comparative study. International Journal of Minerals Metallurgy and Materials. 2021 Mar 1;28(3):450–61.
[6] Fakih MA, Mustapha S, Tarraf J, Ayoub G, Hamade R. Detection and assessment of flaws in friction stir welded joints using ultrasonic guided waves: experimental and finite element analysis. Mechanical Systems and Signal Processing. 2017 Sep 23; 101:516–34.
[7] Yang J, Wang D, Xiao BL, Ni DR, Y Z MA. Effects of rotation rates on microstructure, mechanical properties, and fracture behavior of friction Stir-Welded (FSW) AZ31 magnesium alloy. Metallurgical and Materials Transactions A. 2012 Aug 21;44(1):517–30.
[8] Yang XY, Miura H, Sakai T. Dynamic Nucleation of New Grains in Magnesium Alloy during Hot Deformation. Materials Science Forum. 2003 Mar 15;419–422:515–20.
[9] Navazani M, Dehghani K. Investigation of microstructure and hardness of MG/TIC surface composite fabricated by friction stir processing (FSP). Procedia Materials Science. 2015 Jan 1; 11:509–14.
[10] Yang J, Xiao BL, Wang D, Ma ZY. Effects of heat input on tensile properties and fracture behavior of friction stir welded Mg–3Al–1Zn alloy. Materials Science and Engineering A. 2009 Oct 1;527(3):708–14.
[11] Peng J, Zhang Z, Liu Z, Li Y, Guo P, Zhou W, et al. The effect of texture and grain size on improving the mechanical properties of Mg-Al-Zn alloys by friction stir processing. Scientific Reports. 2018 Mar 2;8(1).
[12] Huang K, Logé RE. A review of dynamic recrystallization phenomena in metallic materials. Materials & Design. 2016 Sep 9; 111:548–74.
[13] Elangovan K, Balasubramanian V. Influences of tool pin profile and tool shoulder diameter on the formation of friction stir processing zone in AA6061 aluminum alloy. Materials & Design (1980-2015). 2007 Feb 23;29(2):362–73.
[14] Wen W, Kuaishe W, Qiang G, Nan W. Effect of friction stir processing on microstructure and mechanical properties of cast AZ31 magnesium alloy. Rare Metal Materials and Engineering. 2012 Sep 1;41(9):1522–6.
[15] Xiao L, Liu L, Zhou Y, Esmaeili S. Resistance-Spot-Welded AZ31 Magnesium Alloys: Part i. Dependence of fusion zone microstructures on Second-Phase particles. Metallurgical and Materials Transactions A. 2010 Mar 26;41(6):1511–22.
[16] Sadeghi A, Pekguleryuz M. Recrystallization and texture evolution of Mg–3%Al–1%Zn– (0.4–0.8) %Sr alloys during extrusion. Materials Science and Engineering A. 2010 Nov 4;528(3):1678–85.
[17] Dixit N, Xie KY, Hemker KJ, Ramesh KT. Microstructural evolution of pure magnesium under high strain rate loading. Acta Materialia. 2015 Jan 23; 87:56–67.
[18] Hou D, Liu T, Luo L, Lu L, Chen H, Shi D. Twinning behaviors of a rolled AZ31 magnesium alloy under multidirectional loading. Materials Characterization. 2016 Dec 23; 124:122–8.
[19] Saikrishna N, Reddy GPK, Munirathinam B, Dumpala R, Jagannatham M, Sunil BR. An investigation on the hardness and corrosion behavior of MWCNT/Mg composites and grain refined Mg. Journal of Magnesium and Alloys. 2018 Mar 1;6(1):83–9.
[20] Hofstetter J, Rüedi S, Baumgartner I, Kilian H, Mingler B, Povoden-Karadeniz E, et al. Processing and microstructure–property relations of high-strength low-alloy (HSLA) Mg–Zn–Ca alloys. Acta Materialia. 2015 Aug 12; 98:423–32.
[21] Xin R, Li B, Liao A, Zhou Z, Liu Q. Correlation between texture variation and transverse tensile behavior of Friction-Stir-Processed AZ31 mg alloy.
Metallurgical and Materials Transactions A. 2012 Mar 7;43(7):2500–8.
[22] Azizieh M, Kokabi AH, Abachi P. Effect of rotational speed and probe profile on microstructure and hardness of AZ31/Al2O3 nanocomposites fabricated by friction stir processing. Materials & Design (1980-2015). 2010 Nov 30;32(4):2034–41.
[23] Baig Z, Mamat O, Mustapha M. Recent progress on the dispersion and the strengthening effect of carbon nanotubes and Graphene-Reinforced metal nanocomposites: a review. Critical Reviews in Solid State and Materials Sciences/CRC Critical Reviews in Solid State and Materials Sciences. 2016 Dec 20;43(1):1–46.
[24] Lan FY, Chen HM, Guo WP, Zhang J, Jin YX. Effects of friction stir processing on mechanical properties and damping capacities of AZ31 magnesium alloys. IOP Conference Series Materials Science and Engineering. 2017 Sep 1; 230:012013.
[25] Park SHC, Sato YS, Kokawa H. Effect of micro-texture on fracture location in friction stir weld of Mg alloy AZ61 during tensile test. Scripta Materialia. 2003 May 13;49(2):161–6.
[26] Liu D, Tang Y, Shen M, Hu Y, Zhao L. Analysis of Weak Zones in Friction Stir Welded Magnesium Alloys from the Viewpoint of Local Texture: A Short Review. Metals. 2018 Nov 20;8(11):970.
[27] Nieto A, Bisht A, Lahiri D, Zhang C, Agarwal A. Graphene reinforced metal and ceramic matrix composites: a review. International Materials Reviews. 2016 Oct 27;62(5):241–302.
[28] Woo W, Choo H, Prime MB, Feng Z, Clausen B. Microstructure, texture and residual stress in a friction-stir-processed AZ31B magnesium alloy. Acta Materialia. 2008 Feb 7;56(8):1701–11
دوره 28، شماره 2
تابستان 1404
صفحه 125-141

  • تاریخ دریافت 11 آذر 1403
  • تاریخ بازنگری 06 بهمن 1403
  • تاریخ پذیرش 14 بهمن 1403