{"title":"准分子激光处理镁合金表面中嵌入纳米颗粒的形成","authors":"B. Majumdar, R. Galun, B. Mordike, A. Weisheit","doi":"10.1080/08981500220151783","DOIUrl":null,"url":null,"abstract":"The surface melting characteristics of AZ91 alloy is investigated using excimer laser (pulses of length 45 ns) under ambient conditions and also a N 2 environment. Experiments are carried out on overlapping spots with close interval. The melt layer hardness for treatment in air is increased to 162 VHN as compared to 73 VHN for the untreated alloy (AZ91 T4 condition), whereas the hardness of the sample treated in an N 2 atmosphere is 116 VHN. A transmission electron microscopy study reveals that the laser treated surface contains nanoparticles of oxide and nitride embedded in the submicron grains of the Mg solid solution. This is responsible for the observed high hardness which gives rise to the improved abrasive resistance. We propose a model to describe the formation of nanoparticles during the laser treatment.","PeriodicalId":49918,"journal":{"name":"Lasers in Engineering","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":"{\"title\":\"Formation of embedded nanoparticles in an excimer laser treated Mg alloy surface\",\"authors\":\"B. Majumdar, R. Galun, B. Mordike, A. Weisheit\",\"doi\":\"10.1080/08981500220151783\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The surface melting characteristics of AZ91 alloy is investigated using excimer laser (pulses of length 45 ns) under ambient conditions and also a N 2 environment. Experiments are carried out on overlapping spots with close interval. The melt layer hardness for treatment in air is increased to 162 VHN as compared to 73 VHN for the untreated alloy (AZ91 T4 condition), whereas the hardness of the sample treated in an N 2 atmosphere is 116 VHN. A transmission electron microscopy study reveals that the laser treated surface contains nanoparticles of oxide and nitride embedded in the submicron grains of the Mg solid solution. This is responsible for the observed high hardness which gives rise to the improved abrasive resistance. We propose a model to describe the formation of nanoparticles during the laser treatment.\",\"PeriodicalId\":49918,\"journal\":{\"name\":\"Lasers in Engineering\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2002-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Lasers in Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1080/08981500220151783\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Lasers in Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1080/08981500220151783","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Formation of embedded nanoparticles in an excimer laser treated Mg alloy surface
The surface melting characteristics of AZ91 alloy is investigated using excimer laser (pulses of length 45 ns) under ambient conditions and also a N 2 environment. Experiments are carried out on overlapping spots with close interval. The melt layer hardness for treatment in air is increased to 162 VHN as compared to 73 VHN for the untreated alloy (AZ91 T4 condition), whereas the hardness of the sample treated in an N 2 atmosphere is 116 VHN. A transmission electron microscopy study reveals that the laser treated surface contains nanoparticles of oxide and nitride embedded in the submicron grains of the Mg solid solution. This is responsible for the observed high hardness which gives rise to the improved abrasive resistance. We propose a model to describe the formation of nanoparticles during the laser treatment.
期刊介绍:
Lasers in Engineering publishes original (primary) research articles, reviews, short communications and letters on all aspects relating to the application of lasers in the many different branches of engineering and related disciplines.
The topics covered by Lasers in Engineering are the use of lasers: in sensors or measuring and for mapping devices; in electrocomponent fabrication; for materials processing; as integral parts of production assemblies; within the fields of biotechnology and bioengineering; in micro- and nanofabrication; as well as the materials and processing aspects of techniques such as cutting, drilling, marking, cladding, additive manufacturing (AM), alloying, welding and surface treatment and engineering.
Lasers in Engineering presents a balanced account of future developments, fundamental aspects and industrial innovations driven by the deployment of lasers. Modern technology has a vitally important role to play in meeting the increasingly stringent demands made on material and production systems. Lasers in Engineering provides a readily accessible medium for the rapid reporting of new knowledge, and technological and scientific advances in these areas.