摘要
以Ti粉、Al粉和CuO粉为原料,通过真空热压烧结工艺合成了Al2O3-Al6.1Cu1.2Ti2.7/TiAl复合材料,采用XRD、SEM及力学性能万能实验机分析研究了材料的相组成、微观结构及力学性能。结果表明:经过1000℃下热压2h所得样品反应完全,复合材料基体主要由Al6.1Cu1.2Ti2.7与TiAl双相组成,Al2O3颗粒弥散分布于基体晶粒间。当原料配比中CuO含量为10wt%时材料弯曲强度达到最大值273.1MPa;当CuO含量在14wt%时复合材料断裂韧性达到最大值6.7MPa.m1/2。由于CuO的掺杂量增加,热压所得复合材料基体相组织呈现从块体到层状结构变化,自生Al2O3相呈现出由弥散分布到局部团聚现象变化。
Al2O3-Al6.1Cu1.2Ti2.7/TiAl composites are successfully reaction-synthesized from the powder mixture of Ti, Al, CuO, using hot pressing reaction synthesis technique in different temperatures. The microstrueture and mechanical properties of the as-sintered products are investigated. It is found that the products are reacted completely after hot pressing in 1000 ℃ for 2 h. Matrix of the composites mainly consist of TiA1 and Al6.l Cu1.2Ti2.7 phases, the fine Al2O3 particles tend to disperse on the grain boundaries. The bending strength and the fracture toughness of the composites increases gradually. Bending strength of the as-sintered products reach the maximum value of 273.1 MPa as the CuO content increases to 10wt% , and the fracture toughness reach the maximum value of 6.7 MPa · m1/2 as the CuO content increases to 14wt%. With the CuO content increasing, the grains are remarkably refined and forming a partial lamellar structure. The in-situ Al2O3 particles are presented from dispersive distribution to partial agglomeration.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2010年第2期399-403,共5页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(50802057
50372037)
关键词
TIAL基复合材料
氧化铜
真空热压
力学性能
微结构
TiAl matrix composites
copper oxide
hot pressing
mechanical properties
microstructure
