Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment

doi:10.3390/ma15207113

IMR OpenIR

	Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment
	Wang, Meng 1,2; Pang, Jianchao 1; Liu, Xinfeng 1,3; Wang, Jianqiu 1,2; Liu, Yongquan 2; Li, Shouxin 1; Zhang, Zhefeng 1
通讯作者	Pang, Jianchao(jcpang@imr.ac.cn) ; Zhang, Zhefeng(zhfzhang@imr.ac.cn)
	2022-10-01
发表期刊	MATERIALS
卷号	15 期号:20 页码:14
摘要	The eutectic cast Al-Si alloys with excellent high-temperature and casting performance are widely used in engine pistons. During frequent starts and stops, the thermo-mechanical fatigue (TMF) is the most important failure cause. Ultrasonic melt treatment (UT) was chosen to compare and investigate the influence of micro-structures on fatigue life and damage mechanisms of as-cast (AC) eutectic Al-Si alloys under TMF loading. After UT, the grain size, primary Si, and intermetallic particles are reduced significantly in the alloy; fatigue life increases obviously. As a result of pilling-up of dislocations, the competitive effects of the critical strain/stress for fatigue crack nucleation can be found. There are two different crack initiation mechanisms under TMF: one is primary Si fracture for AC alloys with limited critical strain/stress for fatigue crack nucleation at fractured Si particles, and the other is primary Si debonding for UT alloys with increasing critical fracture strain/stress. After the crack initiation, the fractured or debonded primary phases provide the advantages for the further development of main cracks for both alloys. The UT alloy (805 +/- 253 cycles) has about twice the TMF life of the AC alloy (403 +/- 98 cycles). The refinement of micro-structures is instrumental in improving the fatigue resistance and life of TMF for the UT alloy.
关键词	eutectic Al-Si alloy thermo-mechanical fatigue ultrasonic melt treatment damage mechanism fatigue life
资助者	National Natural Science Foundation of China (NSFC)
DOI	10.3390/ma15207113
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[51871224] ; National Natural Science Foundation of China (NSFC)[52130002]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000875425800001
出版者	MDPI
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/176393
专题	中国科学院金属研究所
通讯作者	Pang, Jianchao; Zhang, Zhefeng
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Inst Corros Sci & Technol, Guangzhou 510530, Peoples R China 3.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
推荐引用方式 GB/T 7714	Wang, Meng,Pang, Jianchao,Liu, Xinfeng,et al. Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment[J]. MATERIALS,2022,15(20):14.
APA	Wang, Meng.,Pang, Jianchao.,Liu, Xinfeng.,Wang, Jianqiu.,Liu, Yongquan.,...&Zhang, Zhefeng.(2022).Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment.MATERIALS,15(20),14.
MLA	Wang, Meng,et al."Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment".MATERIALS 15.20(2022):14.