Interfacial reactions and bending strength of SiC/A356/FeNi50 composite fabricated by gas pressure infiltration  

气压浸渗法制备SiC/A356/FeNi50复合材料的界面反应和抗弯强度(英文)

作　　者：马春雪[1] 于家康[1] 薛晨[1] 张志庆[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第8期2229-2235,共7页中国有色金属学报（英文版）

基　　金：Project (60776019) supported by the National Natural Science Foundation of China;Project (61-TP-2010) supported by Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China

摘　　要：The SiC/A356/FeNi50 composite was fabricated by gas pressure infiltration. The interfacial region of the SiC/A356/FeNi50 composite consisted of FeNi50 reaction layer, A1 reaction layer and A1 alloy matrix. The main intermetallic compounds were （Fe,Ni）a（A1,Sih3 and （Fe,Ni）2（A1,Si）5 at the A1 reaction layer and FeNi50 reaction layer, respectively. The bending behavior versus different infiltration temperatures and holding times was also investigated. The bending strength at 670 ~C was the highest and close to the bending strength of A1 alloy （223 MPa）, and 46% of SIC/A356. The brittle intermetallic compounds existing at the interface induced the decreasing of the bending strength. The pores were reduced by adequate heating time due to the homogeneous temperature of preform, which was beneficial to improve the bending strength of the composite.采用气压浸渗法制备SiC/A356/FeNi50复合材料。SiC/A356/FeNi50的界面由FeNi50反应层、Al反应层和Al合金基体组成。(Fe,Ni)4(Al,Si)13和(Fe,Ni)2(Al,Si)5作为主要的界面反应产物分别存在于FeNi50反应层和Al反应层中。讨论了不同浸渗温度和保温时间下的材料弯曲行为。结果表明:670℃时的抗弯强度是所有温度下的最好的,与Al合金的(223 MPa)接近,并达到了SiC/A356抗弯强度的46%。由于界面中脆性相的存在而导致抗弯强度的下降。合适的保温时间能使预制体温度更加均匀,减少空洞的形成,这对提高复合材料的抗弯强度具有重要意义。

关 键 词：INFILTRATION metal matrix composites bending strength interracial reactions 

分 类 号：TB333[一般工业技术—材料科学与工程]