Paper Title:
Fatigue Fracture Behavior of Mg-Zn-Y Alloys
  Abstract

Recently, Mg-Zn-Y alloys with superior performance, which have a long period stacking order (LPSO) phase, have been developed. Therefore, it is important to understand fundamental fatigue properties in such materials. In this study, the fatigue fracture behavior of the Mg96Zn2Y2 alloy has been investigated with a plain bending testing machine, which was originally developed for thin sheet specimen at room temperature and 523K. One end of the sheet specimen is fixed at a voice coil of the loudspeaker and the other end is set free. A bending mode resonance occurs in the specimen due to forced vibration at the fixed end. To estimate stress amplitude of bending, deflections at the free end of the specimen oscillating at a frequency of about 200~500Hz was measured by a laser displacement gauge. For comparison, AZ31B alloy also has been investigated. S-N curve for the Mg96Zn2Y2 alloy was obtained using a stress ratio of R=-1, and the fatigue strengths were estimated as 200MPa at room temperature and 120MPa at 523K at 106~107 cycles. These values correspond to about 50% of 0.2% proof strengths of the Mg96Zn2Y2 alloy. Two types of fatigue surface were observed in the Mg96Zn2Y2 alloy. One was striation-like-pattern and the other was relatively flat surface. Striation-like-pattern was similar to fatigue surface of AZ31B. Therefore, these two types of fatigue surface correspond to crack passing through α-Mg phase and LPSO phase, respectively. The feature of fracture surface at 523K was almost the same as that at room temperature.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
267-270
DOI
10.4028/www.scientific.net/MSF.561-565.267
Citation
M. Tsushida, K. Toda, H. Kitahara , S. Ando, H. Tonda, "Fatigue Fracture Behavior of Mg-Zn-Y Alloys", Materials Science Forum, Vols. 561-565, pp. 267-270, 2007
Online since
October 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: P.Y. Li, W. Li, X.L. He, Sheng Long Dai, S.Y. Wang, H.Q. Li, H.T. Yang
Abstract:Large extrusion and forgings of Al-9Fe-1.9Mo-1.7Si (wt.%, FMS0918) aluminum alloy for elevated temperature applications were produced by...
1077
Authors: T.S. Srivatsan, Mithun Kuruvilla, Lisa Park
Abstract:In this technical manuscript the cyclic stress amplitude controlled fatigue properties and fracture behavior of an emerging titanium alloy...
271
Authors: Xiao Ping Luo, Lan Ting Xia, Ming Gang Zhang
Abstract:The effect of Cd and Sb addition on the microstructural and mechanical properties of as-cast AZ31 alloys was investigated and compared. The...
197
Authors: Cui Fang Duan, Wei Li, Ji Liang Zhang
Chapter 4: Material Engineering and its Application Technology
Abstract:This article studies aluminum alloy plate through 16 to 3mm thick with a hole under room temperature fracture test. The experimental results...
315
Authors: Xin Nan Wang, Yue Fei, Xiao Hu Zhou, Zhi Shou Zhu, Jun Li, Guo Qiang Shang, Li Wei Zhu
Abstract:The evolution regularities of microstructure and property of a new metastable β titanium alloy with different solution treatment and aging...
932