【摘要】 分别采用慢应变速率拉伸、恒载荷拉伸加载方法研究了TC11钛合金在不同温度下的Cu脆行为,Cu与钛合金试样表面的接触分别采用离子束增强沉积和机械压合法实现。研究结果表明:在500℃慢速率拉伸条件下,钛合金呈现出较高的铜脆敏感性,而在300℃,400℃时,Cu脆敏感性不明显。在恒载荷试验条件下,500℃时,Cu对钛合金的力学性能影响较低;550℃时,Cu使TC11合金的断裂寿命和塑性指标显著降低。Cu脆的发生必须满足:Cu与钛合金紧密接触;合适的温度;试样应保持一定大小的形变速率。更多还原

【Abstract】 The behavior of solid copper-induced embrittlement(SCIE) of TC11 titanium alloy was investigated using slow strain rate tests(SSRT) and constant load tensile tests(DLTT) at different temperatures.TC11 specimens were contacted with copper by using ion beam enhanced deposition and mechanical pressure methods.The results show that the SCIE susceptibility of TC11 alloy is high at 500 ℃,but it is not noticeable at 300 ℃ or 400 ℃ when SSRT methods are used.While employing constant load tensile tests,the mechanical properties of TC11 alloy are slightly influenced by contacted copper at 500 ℃,but the fracture life and ductility of the titanium alloy are decreased remarkably at 550 ℃ by copper pollution.The prerequisites for SCIE occurrence of this titanium alloy are as follow: copper must be in intimately contact with titaninm alloy surface,suitable temperature and strain rate are need.更多还原