实验证明氧对于钛合金的应力腐蚀起着重大作用。然而在无盐介质中,钛合金在应力和高温空气中使用也会从表面开始脆化。仅图1可以看出,经700℃退火两小时的(?)i—6Al—4V挤压试样,在450℃,47.5千磅/毫米~2(67.5千磅/吋~2应力下,经756小时 Experiments show that oxygen plays a significant role in the stress corrosion of titanium alloys. However, in salt-free media, the use of titanium alloys in stress and high temperature air also embrittles from the surface. As can be seen in Figure 1 only, the (?) I-6Al-4V extruded samples annealed at 700C for two hours were extruded at 450C at a pressure of 67.5 kips / mm2 (67.5 ksi / 756 hours