MoSi_2复合材料断裂韧性的测量及评价  

Measurement and evaluation of fracture toughness of molybdenum disilicide matrix composites

作　　者：刘伯威[1] 樊毅[1] 张金生[1] 潘进[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]广岛大学工学部机械系

出　　处：《粉末冶金材料科学与工程》2001年第4期266-271,共6页Materials Science and Engineering of Powder Metallurgy

摘　　要：对压痕法和单边切口梁法测量MoSi_2基复合材料的断裂韧性进行了研究和分析,提出了压痕法测量MoSi_2基复合材料断裂韧性的计算修正式K_(1C)=0.0336(l/a)^(1/2)(EΦ/H)^(2/5) Ha^(1/2)/Φ.结果表明;单边切口梁法的测量结果随试样切口宽度的增加而增大,压痕法测量的结果随计算式和试验载荷的不同而不同.使用上述修正式将缩小压痕法与SENB法的测量偏差.Vikers microhardness indentation and single edge-notched beam specimen techniques were evaluat-ed, and the medified equation K_(1C) = 0. 0336(l/a)^(-1/2)(EФ/H)^(2/5) Ha^(1/2)/Ф was presented in the measure-ment of fracture toughness of molybdenum disilicide matrix composites. The fracture toughness value oftested material increaed with the increasing of notch breadth in single edge-notched beam technique, theresults of Vikers indentation method had notable difference with using different equations and different ap-plied loads. It was suggested that the modified equation K_(1C) = 0. 0336 (l/a )^(-1/2) (EФ/H)^(2/5) Ha^(1/2)/Фmight be used to improve the accuracy of the evaluation value.

关 键 词：断裂韧性 压痕法 单边切口梁法 MOSI2 

分 类 号：TQ174.758[化学工程—陶瓷工业]