{"title":"反应热压制备(Al_2O_3+TiB_2+Al_3Ti)/Al复合材料的微观结构形成机理","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":35634,"journal":{"name":"Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"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\":35634,\"journal\":{\"name\":\"Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2004-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals\",\"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\":\"Q3\",\"JCRName\":\"Materials Science\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals","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":"Q3","JCRName":"Materials Science","Score":null,"Total":0}
引用次数: 0
摘要
以Al- b_2o_3 - tio_2和Al- b - tio_2为原料，采用热压法制备了两种(Al_2O_3+TiB_2+Al_3Ti)/Al复合材料。采用OM、SEM和TEM分析了两种复合材料的显微组织。结果表明:在热压过程中，形成了几十微米大小的粗Al_3Ti块，同时形成了细小的等轴Al_2O_3和六边形TiB_2颗粒;另一方面，Al、B和TiO_2粉末制备的复合材料中有细小的Al_3Ti析出。挤压后，粗Al_3Ti块体破碎成小块。Al_2O_3颗粒在TiO_2或B_2O_3粉末表面形成，TiB_2颗粒在B或B_2O_3粉末表面形成，颗粒细小，分布分散。粗Al_3Ti块的形成是由于Ti在液态Al中的远距离扩散所致。
Microstructure formation mechanism of (Al_2O_3+TiB_2+Al_3Ti)/Al composites fabricated by reaction hot pressing
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
