Corrosion Fatigue Behavior of beta-titanium alloy as a Small and Light Material

在室内空气中进行脂肪测试，在3% NaC 1解决方案中对β钛合金、Ti-15 Mo-5 Zr-3Al的作用下进行，并按顺序确定该物质对脂肪裂纹生长行为的影响。有三种厚度的特异性，它们是0.5毫米，2毫米和10毫米，已经使用过。所获得的结果与那些人的比较（alpha+beta）-钛合金，Ti-6Al-4V.支付注意力在硬度裂纹增长率、da/dN和压力强度因子范围之间的关系， DELTAK，Ti-15 Mo-5 Zr-3Al合金在室内空气中， da/dN在DELTAK* 10 MPa·m^<1/2>由于减少剂的厚度而增强，while da/dN in DELTAK> 10 MPa·m^<1/2> was almost similar for all the specimens。在其他方面， da/dN与3% NaCl溶液的厚度增加了10毫米，与DELTAK* 5 MPa·m^<1/2>的房间空气进行比较，因此他们在DELTAK> 5 MPa·m ^<1/2>的两个环境都是已知的。对于所有的specimens，Ti-6Al-4V适用，在房间的da/dN-DELTAK关系与所有specimens几乎完全相似，while in 3%NaCl solution da/DN was accelerated markedly in DELTAK> 13 MPa·m^<1/2> for the specimen with a thickness of 0. 5 mm， DELTAK> 1/2 MPa·m^<1/2> for 2 mm and DELTAK> 25 MPa·m^<1/2> for 10 mm。However， da/dNs在两个环境中都与较低DELTAK水平相似，在房间里，在更高的da/dN找到了Ti/15 Mo-5 Zr-3Al合金，比较为Ti-6Al-4V合金。在相反的情况下，在da/DN中的3%氯化钠溶液中没有观察到Ti-15 Mo-5 Zr-3Al合金，表明da/DN高DELTAK地区的并发环境的微小影响。

Fatigue tests in room air and in 3%NaC1 solution were conducted on a beta-titanium alloy, Ti-15Mo-5Zr-3Al, in order to clarify the effects of specimen thickness on fatigue crack growth behavior. The specimens with three kinds of thickness, that is, 0.5mm, 2mm and 10mm, were used. The results obtained were compared with those of (alpha+beta) -titanium alloy, Ti-6Al-4V.Paying attention to the relationships between fatigue crack growth rate, da/dN,and stress intensity factor range, DELTAK,of Ti-15Mo-5Zr-3Al alloy in room air, da/dN in the region of DELTAK*10MPa・m^<1/2> was enhanced with decreasing specimen thickness, while da/dN in DELTAK>10MPa・m^<1/2> was almost similar for all the specimens. On the other hand, da/dN in 3%NaCl solution for the specimen with a thickness of 10mm was enhanced by comparison with those in room air at DELTAK*5MPa・m^<1/2>, though they were identical in both environments at DELTAK>5MPa・m^<1/2> for all the specimens.For Ti-6Al-4V alloy, the da/dN-DELTAK relationships in room air were almost similar for all the specimens, while in 3%NaCl solution da/dN was accelerated markedly in DELTAK>13MPa・m^<1/2> for the specimen with a thickness of 0.5mm, DELTAK>12MPa・m^<1/2> for 2mm and DELTAK>25MPa・m^<1/2> for 10mm. However, da/dNs in both environments were similar in lower DELTAK levels.Consequently, in room air the higher da/dN was found in Ti/15Mo-5Zr-3Al alloy compared to Ti-6Al-4V alloy. On the contrary, in 3%NaCl solution the acceleration in da/dN was not observed for Ti-15Mo-5Zr-3Al alloy, indicating little effect of corrosive environment on da/dN in higher DELTAK region.