具有α″马氏体组织的Ti-3Al-4.5V-5Mo钛合金拉伸变形行为  

Tensile Behavior of Ti-3Al-4.5V-5Mo Titanium Alloy with α″ Martensite

作　　者：李兴无[1] 苏生明 路民旭[1] 沙爱学[3] 储俊鹏[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国航空工业标准件制造有限责任公司,贵阳550014 [3]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2008年第3期82-86,共5页Journal of Aeronautical Materials

摘　　要：研究了具有α″马氏体组织的Ti-3Al-4.5V-5Mo钛合金拉伸变形行为。结果表明:具有α″马氏体组织的Ti-3Al-4.5V-5Mo钛合金具有较低的屈服强度和良好的塑性。在拉伸变形时,α″马氏体晶格重新取向:[010]α″方向平行于拉伸轴线,[100]α″方向垂直于拉伸轴线;b/3a增加,产生了斜方结构α″向密排六方结构α′相的转变。应变产生的α″→α′马氏体转变为位移型无扩散二级相变,热力学计算表明,在拉伸变形条件下发生α″→α′马氏体转变时,体系的自由能降低。The tensile behavior of Ti-3 A1-4. 5V-5 Mo with α″ martensite was studied. The results show that the alloy with α″ microstructures has lower yield strength and higher plasticity. Reorientation of α″martensite occurs during tensile deformation： [010] .direction parallel with tensile axis while [ 100 ] .direction perpendicular to tensile axis. The increasing of b√3a shows that the transition of rhombic α″ to close-packed hexagonal α′ occurs. The transition of α″→α′ induced by strain may be second order phase transformation of displacement type, during which the system free energy calculated decreases.

关 键 词：Ti-3Al-4.5V-5Mo α″马氏体 二级相变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]