High temperature high cycle fatigue behavior of new aluminum alloy strengthened by (Co, Ni)3Al4 particles

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• 作者：Kyu-Sik Kim (1)
  Si-Young Sung (2)
  Bum-Suck Han (2)
  Chang-Yeol Jung (3)
  Kee-Ahn Lee (1)
  
• 关键词：alloys ; casting ; fatigue ; scanning electron microscopy
• 刊名：Metals and Materials International
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：20
• 期：2
• 页码：243-248
• 全文大小：1,379 KB
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• 作者单位：Kyu-Sik Kim (1)
  Si-Young Sung (2)
  Bum-Suck Han (2)
  Chang-Yeol Jung (3)
  Kee-Ahn Lee (1)
  
  1. School of Advanced Materials Engineering, Andong National University, Andong, 760-749, Korea
  2. Korea Automotive Technology Institute, Cheonan, 330-912, Korea
  3. Dongguk University, Gyeongju, 780-714, Korea
  
• ISSN：2005-4149

文摘

High cycle fatigue (HCF) behavior of a new heat-resistant aluminum alloy at elevated temperature was investigated. This alloy consists of an α-Al matrix, a small amount of precipitated Mg2Si, and distributed (Co, Ni)3Al4 strengthening particles. HCF tests were conducted with a stress ratio of (R)=0 and a frequency of (F)=30 Hz at 130 °C. The fatigue limit (maximum stress) of this alloy was 120 MPa at 107 cycles. This is a value superior to that of conventional heat-resistant aluminum alloys such as the A319 alloy. Furthermore, regardless of the stress conditions, the new heat-resistant Al alloy has an outstanding fatigue life at high temperatures. The results of fractography observation showed that second phases, especially (Co, Ni)3Al4 particles, were effective to the resistance of fatigue crack initiation and propagation. On the other hand, Mg2Si particles were more easily fractured by the fatigue crack. This study also clarifies the micromechanism of fatigue deformation behavior at elevated temperature related to its microstructure.