| Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al-Si Alloy by the Ultrasonic Melt Treatment | |
| Wang, Meng1,2; Pang, Jianchao1; Liu, Xinfeng1,3; Wang, Jianqiu1,2; Liu, Yongquan2; Li, Shouxin1; Zhang, Zhefeng1 | |
| Corresponding Author | Pang, Jianchao(jcpang@imr.ac.cn) ; Zhang, Zhefeng(zhfzhang@imr.ac.cn) |
| 2022-10-01 | |
| Source Publication | MATERIALS
 |
| Volume | 15Issue:20Pages:14 |
| Abstract | 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. |
| Keyword | eutectic Al-Si alloy thermo-mechanical fatigue ultrasonic melt treatment damage mechanism fatigue life |
| Funding Organization | National Natural Science Foundation of China (NSFC) |
| DOI | 10.3390/ma15207113 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China (NSFC)[51871224] ; National Natural Science Foundation of China (NSFC)[52130002] |
| WOS Research Area | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
| WOS Subject | Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| WOS ID | WOS:000875425800001 |
| Publisher | MDPI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/176393 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Pang, Jianchao; Zhang, Zhefeng |
| Affiliation | 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 |
| Recommended Citation 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. |
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