{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T19:55:06Z","timestamp":1792007706572,"version":"4.4.0"},"reference-count":32,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2022,10,13]],"date-time":"2022-10-13T00:00:00Z","timestamp":1665619200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China (NSFC)","award":["51871224"],"award-info":[{"award-number":["51871224"]}]},{"name":"National Natural Science Foundation of China (NSFC)","award":["52130002"],"award-info":[{"award-number":["52130002"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The eutectic cast Al\u2013Si 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\u2013Si 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 \u00b1 253 cycles) has about twice the TMF life of the AC alloy (403 \u00b1 98 cycles). The refinement of micro-structures is instrumental in improving the fatigue resistance and life of TMF for the UT alloy.<\/jats:p>","DOI":"10.3390\/ma15207113","type":"journal-article","created":{"date-parts":[[2022,10,13]],"date-time":"2022-10-13T22:21:11Z","timestamp":1665699671000},"page":"7113","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Optimization of Thermo-Mechanical Fatigue Life for Eutectic Al\u2013Si Alloy by the Ultrasonic Melt Treatment"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1578-3154","authenticated-orcid":false,"given":"Meng","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"},{"name":"Institute of Corrosion Science and Technology, Guangzhou 510530, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianchao","family":"Pang","sequence":"additional","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinfeng","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"},{"name":"School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianqiu","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"},{"name":"Institute of Corrosion Science and Technology, Guangzhou 510530, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongquan","family":"Liu","sequence":"additional","affiliation":[{"name":"Institute of Corrosion Science and Technology, Guangzhou 510530, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shouxin","family":"Li","sequence":"additional","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhefeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"106359","DOI":"10.1016\/j.ijfatigue.2021.106359","article-title":"Experimental investigation of the damage characteristics of two cast aluminium alloys: Part I\u2013Temperature dependent low cycle and thermomechanical fatigue behavior","volume":"152","author":"Fischer","year":"2021","journal-title":"Int. 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