纯钛BT1-0低周疲劳损伤机理的研究  

Study on Damage Mechanism of LCF of Pure Titanium BT1-0

作　　者：丰崇友[1] 王兴国[1] 于海生[1] 佟立丰[1] 刘义虎[1] 

机构地区：[1]佳木斯大学材料科学与工程学院,黑龙江佳木斯154007

出　　处：《佳木斯大学学报（自然科学版）》2006年第1期22-24,共3页Journal of Jiamusi University：Natural Science Edition

基　　金：黑龙江省骨干教师科研基金(1055G047)

摘　　要：在室温拉-扭载荷下研究了纯钛BT1-0低周疲劳循环变形的宏观特性,结果显示材料的循环变形行为与应变幅值有关,遵循Coffin-Manson关系.通过透射电镜观察了在低周疲劳过程中位错组态,TEM观察表明:材料在比例载荷的损伤变形为滑移位错;在非比例载荷形成了孪晶结构,孪晶形态和尺寸与相位角相关.分析了该材料在低周疲劳损伤的微观行为.Low cycle fatigue properties of the pure Titanium BT1-0 were investigated using symmetric tension-torsion test at room temperature. The results indicate that the material displays cyclic deformation behavior related with cycle plastic strain ranges and it obeys Coffin-Manson relationship. The Transmission Electron Microscope （TEM） observation on the dislocation sub-structures of pure Titanium BT1-0 shows that the material damage deformation mainly is slippage under proportional low-cycle loadings and twin under non-proportional low-cycle loading, and the twin sub-structure is correlated with micro-size and phase angle. The damage micro behavior of low cycle fatigue of pure Titanium BT1-0 is analyzed as well.

关 键 词：低周疲劳 纯钛BT1-0 位错 孪晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG113.255[金属学及工艺—金属材料]