反应物形态对原位生长陶瓷粒子增强铝基复合材料微观结.pdf

第35卷第1期金属学报Vol.35No.1
1999年1月ACTAMETALLURGICASINICAJanuary1999

反应物形态对原位生长陶瓷粒子增强铝基
复合材料微观结构和拉伸性能的影响3

马宗义吕毓雄毕敬
(中国科学院金属研究所,沈阳110015)
(上海交通大学金属基复合材料国家重点实验室,上海200030)

摘要对Ti-Al-B,TiO2-Al-B和TiO2-Al-B2O3三个体系利用反应热压方法制备了原位TiB2粒子增强Al(TiB2/Al)和

原位Al2O3,TiB2粒子增强Al(Al2O3·TiB2/Al)复合材料.Ti-Al-B体系中形成的TiB2为最大尺寸可达5μm的具有一定长宽比

的块状或棒状粒子,此外还有一定量尺寸可达几十微米的不规则块状Al3Ti生成.TiO2-Al-B体系中形成小于2μm等轴的

Al2O3和TiB2粒子,基本没有Al3Ti生成.TiO2-Al-B2O3体系中除细小等轴状的Al2O3和TiB2粒子外,还生成尺寸为几十微米

的条状Al3Ti.拉伸试验表明,由TiO2-Al-B体系制备的复合材料具有最高的强度和塑性.对三个体系所制备复合材料差异的
微观结构和性能做出了解释.

关键词铝基复合材料,原位生长,Al2O3,TiB2
中图法分类号TB331,TG113文献标识码A文章编号0412-1961(1999)01-0098-102

EFFECTSOFREACTANTSONMICROSTRUCTUREAND
TENSILEPROPERTIESOFINSITUFORMEDCERAMIC
PARTICULATESREINFORCEDALUMINUMMATRIX
COMPOSITES
MAZongyi,LBYuxiong,BIJing
InstituteofMetalResearch,TheChineseAcademyofSciences,Shenyang110015
TheStateKeyLaboratoryofMetalMatrixComposites,ShanghaiJiaotongUniversity,Shanghai200030
Correspondent:MAZongyi,associateprofessor,Tel:[phone]-55783,Fax:[phone]
Manuscriptreceived1998-03-11,inrevisedform1998-07-10

ABSTRACTTheinsituTiB2particulatereinforcedaluminum(TiB2/Al)andinsituAl2O3andTiB2par2
ticulatesreinforcedaluminum(Al2O3·TiB2/Al)compositeswerefabricatedbyreactionhotpressingmethod
fromTi-Al-B,TiO2-Al-BandTiO2-Al-B2O3systems.Block-likeorrod-likeTiB2particulates
withanaspectratiooflargerthan1andamaximumsizeof5μmwereformedintheTi-Al-Bsystem.
Inaddition,acertainamountofirregularblock-likeAl3Tiwithasizeofseveraltensofmicrometerswere
alsogeneratedintheTi-Al-Bsystem.FineequiaxedAl2O3andTiB2particulates(smallerthan2μm)
wereformedintheTiO2-Al-Bsystem,andbasicallynoAl3Tiwasformed.Inadditiontofineequiaxed
Al2O3andTiB2particulates,strip-likeAl3Tiwithasizeofseveraltensofmicrometersweregeneratedin

theTiO2-Al-B2O3system.TensiletestsindicatedthatthecompositefabricatedfromTiO2-Al-Bsys2
temexhibitedthehigheststrengthandductility.Thedifferencesinmicrostructureandpropertybetween
thecompositesfabricatedfromthethreesystemswereexplained.
KEYWORDSAlmatrixcomp