{"title":"Wear behavior and microstructure evolution of lamellar γ-TiAl alloy at room and elevated temperatures","authors":"","doi":"10.1016/j.triboint.2024.110168","DOIUrl":null,"url":null,"abstract":"<div><p>The wear behavior of lamellar Ti-46Al-2Nb-2Cr was investigated by reciprocating sliding at room and service temperatures. The wear scar and subsurface microstructure were studied via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The coefficient of friction (COF) increased with the temperature. However, the wear volume loss first decreased and then increased, due to the formation of a relatively complete tribo-layer at 750 ℃. Abrasive wear, oxidative wear and adhesive wear were activated at elevated temperatures. Reciprocating sliding introduced gradient nano-grained structures covered with tribo-layers. Compared to room temperature, the oxidative tribo-layer and nano-grained layer formed at 750 ℃ were thicker. And the nano-grains were finer. Nano-grains at room temperature and 750 ℃ were related to defects and enhanced dynamic recrystallization, respectively.</p></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tribology International","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301679X24009204","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The wear behavior of lamellar Ti-46Al-2Nb-2Cr was investigated by reciprocating sliding at room and service temperatures. The wear scar and subsurface microstructure were studied via scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The coefficient of friction (COF) increased with the temperature. However, the wear volume loss first decreased and then increased, due to the formation of a relatively complete tribo-layer at 750 ℃. Abrasive wear, oxidative wear and adhesive wear were activated at elevated temperatures. Reciprocating sliding introduced gradient nano-grained structures covered with tribo-layers. Compared to room temperature, the oxidative tribo-layer and nano-grained layer formed at 750 ℃ were thicker. And the nano-grains were finer. Nano-grains at room temperature and 750 ℃ were related to defects and enhanced dynamic recrystallization, respectively.
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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