Dynamic fracture toughness of TA15ELI alloy studied by instrumented impact test

查看全文 作　　者：LIU Rui,HUI Songxiao,YE Wenjun,XIONG Baiqing,YU Yang,and FU Yanyan State Key Laboratory for Fabrication & Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Rare Metals》索引2010年第29卷第6期,共5页

摘　　要：The dynamic fracture toughness of TA15ELI alloy with two types of microstructures was studied by instrumented impact test.Charpy specimens with both the 0.2 mm U-notch and the a/W = 0.2 pre-crack were adopted to compare notch sensitivity in the two microstructures.The result shows that the specimen with Widmanst?tten microstructure exhibits a better dynamic fracture toughness and lower notch sensitivity than that with lath-like microstructure.Fracture surfaces in the case of the two microstructures are analyzed to have a ductile and brittle mixed feature under dynamic loading.The fracture surface of lath-like microstructure is composed of dimples and tear ridges,while that of Widmanst?tten microstructure is covered with rough block-like facets and dimples and tear ridges.The α phase boundaries and α/β interfaces act as locations for void nucleation and crack arrest and deviation.The decrease in width of α phase lamellae leads to the increase in the amount of boundaries and interfaces,which causes the increase in the consumption of impact energy and results in the improvement in dynamic fracture toughness. 关键词：动态断裂韧性仪器化冲击试验合金表面微观结构缺口敏感性加载条件空穴萌生能源消耗

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Dynamic fracture toughness of TA15ELI alloy studied by instrumented impact test

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