{"title":"Microstructure formation mechanism of (Al_2O_3+TiB_2+Al_3Ti)/Al composites fabricated by reaction hot pressing","authors":"Wang Gui-song","doi":"10.4028/0-87849-456-1.1439","DOIUrl":null,"url":null,"abstract":"Two (Al_2O_3+TiB_2+Al_3Ti)/Al composites were made from Al-B_2O_3-TiO_2 and Al-B-TiO_2 raw powders by hot pressing. The microstructure of the two composites was analyzed by OM, SEM and TEM. The results show that coarse Al_3Ti blocks with size of several tens of micrometers are formed during hot pressing, and the fine equiaxed Al_2O_3 and hexagon TiB_2 particulates are formed simultaneously. On the other hand, there are fine Al_3Ti precipitates in the composite fabricated from Al, B and TiO_2 powders. After extrusion, the coarse Al_3Ti blocks are broken into small pieces. Al_2O_3 particles are formed on the surface of TiO_2 or B_2O_3 powder, TiB_2 particles are formed on B or B_2O_3 powders, and they are fine and dispersively distributed. The formation of coarse Al_3Ti block is resulted from long-distance diffusion of Ti in liquid Al.","PeriodicalId":22389,"journal":{"name":"","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.4028/0-87849-456-1.1439","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Two (Al_2O_3+TiB_2+Al_3Ti)/Al composites were made from Al-B_2O_3-TiO_2 and Al-B-TiO_2 raw powders by hot pressing. The microstructure of the two composites was analyzed by OM, SEM and TEM. The results show that coarse Al_3Ti blocks with size of several tens of micrometers are formed during hot pressing, and the fine equiaxed Al_2O_3 and hexagon TiB_2 particulates are formed simultaneously. On the other hand, there are fine Al_3Ti precipitates in the composite fabricated from Al, B and TiO_2 powders. After extrusion, the coarse Al_3Ti blocks are broken into small pieces. Al_2O_3 particles are formed on the surface of TiO_2 or B_2O_3 powder, TiB_2 particles are formed on B or B_2O_3 powders, and they are fine and dispersively distributed. The formation of coarse Al_3Ti block is resulted from long-distance diffusion of Ti in liquid Al.
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
