Investigation on mechanical behaviour of AM60 magnesium alloys

• Autorzy: Yan C. , Bai R. X. , Gu Y. T. , Ma J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: In this work, tension, impact, bend and fatigue tests were conducted in an AM60 magnesium alloy. The effects of environmental temperature and loading rates on impact and tension behavior of the alloy were also investigated. Design/methodology/approach: The tests were conducted using an Instron universal testing machine. The loading speed was changed from 1 mm/min to 300 mm/min to gain a better understanding of the effect of strain rate. To understand the failure behavior of this alloy at different environmental temperatures, Charpy impact test was conducted in a range of temperatures (-40;∼ 35*C). Plane strain fracture toughness (K _IC) was evaluated using compact tension (CT) specimen. To gain a better understanding of the failure mechanisms, all fracture surfaces were observed using scanning electron microscopy (SEM). In addition, fatigue behavior of this alloy was estimated using tension test under tension-tension condition at 30 Hz. The stress amplitude was selected inó the range of 20;∼ 50 MPa to obtain the S-N curve. Findings: The tensile test indicated that the mechanical properties were not sensitive to the strain rates applied 3.3x10 -4 ∼ 0.1) and the plastic deformation was dominated by twining mediated slip. The impact energy is not sensitive to the environmental temperature. The plane strain fracture toughness and fatigue limit were evaluated and the average values were 7.6 MPa.m1/2 and 25 MPa, respectively. Practical implications: Tested materials AM60 Mg alloy can be applied among others in automotive industry aerospace, communication and computer industry. Originality/value: Many investigations have been conducted to develop new Mg alloys with improved stiffness and ductility. On the other hand, relatively less attention has been paid to the failure mechanisms of Mg alloys, such as brittle fracture and fatigue, subjected to different environmental or loading conditions. In this work, tension, impact, bend and fatigue tests were conducted in an AM60 magnesium alloy.

Słowa kluczowe

EN

magnesium alloy; mechanical behaviour; yield; fracture; fatigue

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2008
• Tom: Vol. 31, nr 2
• Strony: 398--401
• Opis fizyczny: Bibliogr. 7 poz., wykr.

Twórcy

autor

Yan C.

autor

Bai R. X.

autor

Gu Y. T.

autor

Ma J.

• School of Engineering Systems, Queensland University of Technology, QLD 4001, Australia,

Bibliografia

• [1] L. Lu, K. Raviprasad, M. O. Lai, Nanostructured Mg-5%Al- X%Nd alloys, Materials Science and Engineering A368 (2004) 117-125.
• [2] L. Lu, M. O. Lai, S. H. Lim, B. W. Chua, C. Yan, L. Ye, From waste to high strength alloy-recycling of magnesium chips, Zeitschrift fur Metallkunde 97 (2006) 169-173.
• [3] C. Yan, L. L. Yan, L. Ye, L. Lu, M. O. Lai, Y. W. Mai, Synthesis and mechanical properties of nanostructured Mg-Al-Nd alloys, Advanced Materials Research 9 (2005) 93-100.
• [4] A. Singh, M. Watanabe, A. Kato, A. P. Tsai, Formation of icosahedral-hexagonal H phase composites in Mg-Zn-Y alloys, Scripta Materialia 51 (2004) 955-960.
• [5] H. K. Kim, Y. I. Lee, C. S. Chung, Fatigue properties of a finegrained magnesium alloy produced by equal channel angular pressing, Scripta Materialia 52 (2005) 473-477.
• [6] V. Gartnerova, Z. Trojanova, A. Jager, P. Palcek, Deformation behaviour of Mg-0.7 wt.% Nd alloy, Journal of Alloys and Compounds 378 (2004) 180-183.
• [7] P. Zhang, B. Watzinger, P. Q. Kong, W. Blum, Microstructural evolution during creep of the Mg-Al-alloy AZ91hp, Key Engineering Materials 171-174 (2000)609+616.