The statistical analysis of tensile and compression properties of the as-cast AZ91-X%B4C composites

  • H. Mohammadi
  • M. EmamyEmail author
  • Z. Hamnabard


The statistical distribution of the ultimate tensile strength (UTS) and compression strength (UCS) values of the cast B4C containing Mg matrix composite and its matrix alloy (AZ91) was assessed using different amounts of B4C (1, 3, 5, and 7 wt%) by the use of two-parameter Weibull analysis. Microstructural observations of the composites revealed a reduction in the amount of the Mg17Al12 intermetallic phase, a rather clean interface between B4C particles and the matrix and a good distribution of the B4C reinforcement in the matrix. It was found that the addition of B4C particles to the matrix alloy resulted in the reduction in UTS and elongation values, whereas the compressive strength enhanced slightly. Weibull modulus of the castings was found to be ~ 10 for AZ91 alloy, falling to ~ 6 in the AZ91–7%B4C, but in the compression test, it varied from ~ 52 to ~ 87. The fracture study of the tensile specimens revealed that oxide films and porosity are the main factors for the decreased strength and scattered results, which are increased by using more B4C contents. If the composite can be manufactured with less amount of oxides, it is seen to be more reliable for compressive applications.


AZ91–B4C composite tensile properties fractography Weibull distributions 



The authors gratefully acknowledge University of Tehran for laboratory facilities and financial support of this work.


  1. 1.
    M. Bian, T. Sasaki, T. Nakata, S. Kamado, K. Hono, Effects of rolling conditions on the microstructure and mechanical properties in a Mg–Al–Ca–Mn–Zn alloy sheet. Mater. Sci. Eng. A 730, 147–154 (2018)CrossRefGoogle Scholar
  2. 2.
    B. Pourbahari, H. Mirzadeh, M. Emamy, R. Roumina, “Enhanced ductility of a fine-grained Mg–Gd–Al–Zn magnesium alloy by hot extrusion. Adv. Eng. Mater. 20, 1701171 (2018)CrossRefGoogle Scholar
  3. 3.
    Bita Pourbahari, Hamed Mirzadeh, Massoud Emamy, The effects of grain refinement and rare earth intermetallics on mechanical properties of as-cast and wrought magnesium alloys. J. Mater. Eng. Perform. 27(3), 1327–1333 (2018)CrossRefGoogle Scholar
  4. 4.
    Liuwei Zheng, Huihui Nie, Wanggang Zhang, Wei Liang, Yide Wang, Microstructural refinement and improvement of mechanical properties of hot-rolled Mg–3Al–Zn alloy sheets subjected to pre-extrusion and Al-Si alloying. Mater. Sci. Eng. A 722, 58–68 (2018)CrossRefGoogle Scholar
  5. 5.
    Zheng Tian, Qiang Yang, Kai Guan, Jian Meng, Zhanyi Cao, Microstructure and mechanical properties of a peak-aged Mg–5Y–2.5 Nd–1.5 Gd–0.5 Zr casting alloy. J. Alloys Compd. 731, 704–713 (2018)CrossRefGoogle Scholar
  6. 6.
    Zhang Ting, Lehua Qi, Fu Jiawei, Jiming Zhou, Xujiang Chao, Effect of SiC nanowires addition on the interfacial microstructure and mechanical properties of the Cf-SiCNWs/AZ91D composite. J. Alloys Compd. 776, 746–756 (2019)CrossRefGoogle Scholar
  7. 7.
    T.A. Davis, L. Bichler, F. D’Elia, N. Hort, Effect of TiBor on the grain refinement and hot tearing susceptibility of AZ91D magnesium alloy. J. Alloys Compd. 759, 70–79 (2018)CrossRefGoogle Scholar
  8. 8.
    T.A. Davis, L. Bichler, Novel fabrication of a TiB2 grain refiner and its effect on reducing hot tearing in AZ91D magnesium alloy. J. Mater. Eng. Perform. 27(9), 4444–4452 (2018)CrossRefGoogle Scholar
  9. 9.
    Jiawei Yuan, Ting Li, Kui Zhang, Meng Li, Xinggang Li, Yongjun Li, Minglong Ma, Guoliang Shi, Effect of Zn content on the microstructures, mechanical properties, and damping capacities of Mg–7Gd–3Y–1Nd–0.5 Zr based alloys. J. Alloys Compd. 773, 919–926 (2019)CrossRefGoogle Scholar
  10. 10.
    Kai Guan, Baishun Li, Qiang Yang, Xin Qiu, Zheng Tian, Dongdong Zhang, Deping Zhang et al., Effects of 1.5 wt% samarium (Sm) addition on microstructures and tensile properties of a Mg–6.0 Zn–0.5 Zr alloy. J. Alloys Compd. 735, 1737–1749 (2018)CrossRefGoogle Scholar
  11. 11.
    M. Lotfpour, M. Emamy, C. Dehghanian, B. Pourbahari, “Ca addition effects on the microstructure, tensile and corrosion properties of Mg matrix alloy containing 8 wt% Mg2Si. J. Mater. Eng. Perform. 27(2), 411–422 (2018)CrossRefGoogle Scholar
  12. 12.
    Longhui Mao, Chuming Liu, Tao Chen, Yonghao Gao, Shunong Jiang, Renke Wang, Twinning behavior in a rolled Mg–Al–Zn alloy under dynamic impact loading. Scr. Mater. 150, 87–91 (2018)CrossRefGoogle Scholar
  13. 13.
    Z. Hu, R. Liu, S. Kairy, X. Li, H. Yan, N. Birbilis, Effect of Sm additions on the microstructure and corrosion behavior of magnesium alloy AZ91. Corros. Sci. 149, 144–152 (2019)CrossRefGoogle Scholar
  14. 14.
    Babak Kondor, Reza Mahmudi, Effect of Ca additions on the microstructure and creep properties of a cast Mg–Al–Mn magnesium alloy. Mater. Sci. Eng. A 700, 438–447 (2017)CrossRefGoogle Scholar
  15. 15.
    B. Sahoo, F.K. Moh, S. Babu, S. Panigrahi, G.D. Janaki Ram, Microstructural modification and its effect on strengthening mechanism and yield asymmetry of in situ TiC-TiB2/AZ91 magnesium matrix composite. Mater. Sci. Eng. A 724, 269–282 (2018)CrossRefGoogle Scholar
  16. 16.
    M. Emamy, K. Tavighi, B. Pourbahari, A.B. Eradi-Zare, Improvement in tensile and wear properties of as-cast Al–Mg2Si composite modified by Zn and Ni. Int. J. Metalcast. 11(4), 790–801 (2016)CrossRefGoogle Scholar
  17. 17.
    A. Azad, L. Bichler, A. Elsayed, Effect of a novel Al-SiC grain refiner on the microstructure and properties of AZ91E magnesium alloy. Int. J. Metalcast. 7(4), 49–59 (2013)CrossRefGoogle Scholar
  18. 18.
    S.-J. Huang, A.N. Ali, “Effects of heat treatment on the microstructure and microplastic deformation behavior of SiC particles reinforced AZ61 magnesium metal matrix composite. Mater. Sci. Eng. A 711, 670–682 (2018)CrossRefGoogle Scholar
  19. 19.
    A. Khandelwal, K. Mani, N. Srivastava, R. Gupta, G.P. Chaudhari, Mechanical behavior of AZ31/Al2O3 magnesium alloy nanocomposites prepared using ultrasound assisted stir casting. Compos. Part B Eng. 123, 64–73 (2017)CrossRefGoogle Scholar
  20. 20.
    S. Sankaranarayanan, R. Sabat, S. Jayalak, S. Jayalakshmi, S. Suwas, M. Gupta, Microstructural evolution and mechanical properties of Mg composites containing nano-B4C hybridized micro-Ti particulates. Mater. Chem. Phys. 143(3), 1178–1190 (2014)CrossRefGoogle Scholar
  21. 21.
    Cun-Zhu Nie, Gu Jia-Jun, Jun-Liang Liu, Di Zhang, Investigation on microstructures and interface character of B4C particles reinforced 2024Al matrix composites fabricated by mechanical alloying. J. Alloys Compd. 454, 118–122 (2008)CrossRefGoogle Scholar
  22. 22.
    L.F. Guleryuz, S. Ozan, D. Uzunsoy, R. Ipek, An investigation of the microstructure and mechanical properties of B4C reinforced PM magnesium matrix composites. Powder Metall. Met. Ceram. 51(7–8), 456–462 (2012)CrossRefGoogle Scholar
  23. 23.
    I. Aatthisugan, A. Razal Rose, D. Selwyn Jebadurai, Mechanical and wear behaviour of AZ91D magnesium matrix hybrid composite reinforced with boron carbide and graphite. J. Magnes. Alloys 5(1), 20–25 (2017)CrossRefGoogle Scholar
  24. 24.
    A. Elsayed, E. Vandersluis, S.L. Sin, C. Ravindran, Inclusions in permanent mold cast magnesium ZE41A and AZ91D alloys. Int. J. Metalcast. 11(4), 749–765 (2017)CrossRefGoogle Scholar
  25. 25.
    M. Paradis, A.M. Samuel, H.W. Doty, F.H. Samuel, Inclusion measurement and identification in Mg-based alloys: application of the Brightimeter technique. Int. J. Metalcast. 12(1), 2–19 (2018)CrossRefGoogle Scholar
  26. 26.
    John Campbell, Complete Casting Handbook: Metal Casting Processes, Metallurgy, Techniques and Design (Butterworth-Heinemann, Oxford, 2015)Google Scholar
  27. 27.
    Nick R. Green, John Campbell, Statistical distributions of fracture strengths of cast Al–7Si–Mg alloy. Mater. Sci. Eng. A 173(1–2), 261–266 (1993)CrossRefGoogle Scholar
  28. 28.
    Roman Aigner, Martin Leitner, Michael Stoschka, Christian Hannesschläger, Thomas Wabro, Robert Ehart, Modification of a defect-based fatigue assessment model for Al–Si–Cu cast alloys. Materials 11(12), 2546 (2018)CrossRefGoogle Scholar
  29. 29.
    E. Barbero, J. Fernández-Sáez, C.N. Ugena, Statistical analysis of the mechanical properties of composite materials. Compos. Part B Eng. 31(5), 375–381 (2000)CrossRefGoogle Scholar
  30. 30.
    S. Babu, A.V. Jayabalan, Statistical analysis of the fracture strengths of aluminum alloy–alumina (Al2O3) particulate composites. J. Mater. Sci. 45(24), 6586–6592 (2010)CrossRefGoogle Scholar
  31. 31.
    Massoud Emamy, Ahmad Razaghian, Shirin Kaboli, John Campbell, Statistical analysis of tensile properties of cast A357/Al2O3 MMCs. Mater. Sci. Technol. 26(2), 149–156 (2010)CrossRefGoogle Scholar
  32. 32.
    Chaoqiang Liu, Houwen Chen, Nicholas C. Wilson, Jianfeng Nie, Zn segregation in interface between Mg17Al12 precipitate and Mg matrix in Mg–Al–Zn alloys. Scr. Mater. 163, 91–95 (2019)CrossRefGoogle Scholar
  33. 33.
    Jiashi Miao, Weihua Sun, Andrew D. Klarner, Alan A. Luo, Interphase boundary segregation of silver and enhanced precipitation of Mg 17 Al 12 Phase in a Mg–Al–Sn–Ag alloy. Scr. Mater. 154, 192–196 (2018)CrossRefGoogle Scholar
  34. 34.
    S.K. Thakur, B.K. Dhindaw, N. Hort, K.U. Kainer, Some studies on the thermal-expansion behavior of c-fiber, SiC p, and in situ Mg 2 Si-Reinforced AZ31 Mg alloy-Based hybrid composites. Metall. Mater. Trans. A 35(3), 1167–1176 (2004)CrossRefGoogle Scholar
  35. 35.
    Mahdi Habibnejad-Korayem, Reza Mahmudi, Warren J. Poole, Enhanced properties of Mg-based nano-composites reinforced with Al2O3 nano-particles. Mater. Sci. Eng. A 519(1–2), 198–203 (2009)CrossRefGoogle Scholar
  36. 36.
    E. Ghasali, M. Alizadeh, T. Ebadzadeh, A.H. Pakseresht, A. Rahbari, Investigation on microstructural and mechanical properties of B4C–aluminum matrix composites prepared by microwave sintering. J. Mater. Res. Technol. 4(4), 411–415 (2015)CrossRefGoogle Scholar
  37. 37.
    P.C. Kang Pengchao Kang, Z.W. Cao, G. Wu, J.H. Zhang, D.J. Wei, L.T. Lin, Phase identification of Al–B4C ceramic composites synthesized by reaction hot-press sintering. Int. J. Refract. Met. Hard Mater. 28(2), 297–300 (2010)CrossRefGoogle Scholar
  38. 38.
    Y.G. Zhao, Q.D. Qin, Y.H. Liang, W. Zhou, Q.-C. Jiang, In-situ Mg2Si/Al–Si–Cu composite modified by strontium. J. Mater. Sci. 40(7), 1831–1833 (2005)CrossRefGoogle Scholar
  39. 39.
    N.R. Bandyopadhyay, S. Ghosh, A. Basumallick, New generation metal matrix composites. Mater. Manuf. Process. 22(6), 679–682 (2007)CrossRefGoogle Scholar
  40. 40.
    M. Pokorny, C.A. Monroe, C. Beckermann, L. Bichler, C.R. Rhuparavindran, Prediction of hot tear formation in a magnesium alloy permanent mold casting. Int. J. Metalcast. 2(4), 41–53 (2008)CrossRefGoogle Scholar
  41. 41.
    KMd Shorowordi, T. Laoui, ASMd Abdul Haseeb, J.P. Célis, L. Froyen, Microstructure and interface characteristics of B4C, SiC and Al2O3 reinforced Al matrix composites: a comparative study. J. Mater. Process. Technol. 142(3), 738–743 (2003)CrossRefGoogle Scholar
  42. 42.
    J.C. Yarwood, J.E. Dore, R.K. Preuss. Ceramic foam filter. U.S. Patent 3,962,081, issued June 8, 1976Google Scholar
  43. 43.
    Cagri Tekmen, İsmail Özdemir, Ümit Cöcen, Kazim Önel, The mechanical response of Al–Si–Mg/SiCp composite: influence of porosity. Mater. Sci. Eng. A 360(1–2), 365–371 (2003)CrossRefGoogle Scholar
  44. 44.
    V. Laurent, P. Jarry, G. Regazzoni, D. Apelian, Processing-microstructure relationships in compocast magnesium/SiC. J. Mater. Sci. 27(16), 4447–4459 (1992)CrossRefGoogle Scholar
  45. 45.
    B. Ghasem Eisaabadi, P. Davami, S. Kim, M. Tiryakioglu, The effect of melt quality and filtering on the Weibull distributions of tensile properties in Al–7% Si–Mg alloy castings. Mater. Sci. Eng. A 579, 64–70 (2013)CrossRefGoogle Scholar
  46. 46.
    James T. Staley, Murat Tiryakioğlu, John Campbell, The effect of hot isostatic pressing (HIP) on the fatigue life of A206-T71 aluminum castings. Mater. Sci. Eng. A 465(1–2), 136–145 (2007)CrossRefGoogle Scholar
  47. 47.
    M. Asadiannozari, R. Taghiabadi, M. Karimzadeh, M. Ghoncheh, Effect of be modification on the oxide bifilms and tensile strength reliability of Al–Si–Mg alloys containing excess Fe. Metall. Mater. Trans. B 49(3), 1236–1245 (2018)CrossRefGoogle Scholar
  48. 48.
    L. Babout, Y.J.M. Bréchet, E. Ericmaire, R. Fougères, On the competition between particle fracture and particle decohesion in metal matrix composites. J. Acta Mater. 52(15), 4517–4525 (2004)CrossRefGoogle Scholar
  49. 49.
    Burhanettin Inem, Geoffrey Pollard, Interface structure and fractography of a magnesium-alloy, metal-matrix composite reinforced with SiC particles. J. Mater. Sci. 28(16), 4427–4434 (1993)CrossRefGoogle Scholar
  50. 50.
    Giordano Camicia, Giulio Timelli, Grain refinement of gravity die cast secondary AlSi7Cu3Mg alloys for automotive cylinder heads. Trans. Nonferrous Met. Soc. China 26(5), 1211–1221 (2016)CrossRefGoogle Scholar
  51. 51.
    Waloddi Weibull, Wide applicability. J. Appl. Mech. 103(730), 293–297 (1951)Google Scholar

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© American Foundry Society 2019

Authors and Affiliations

  1. 1.School of Metallurgy and Materials Engineering, Alborz CampusUniversity of TehranAlborzIran
  2. 2.School of Metallurgy and Materials, College of EngineeringUniversity of TehranTehranIran
  3. 3.Imam Khomeini International UniversityQazvinIran

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