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钛合金固体银致脆行为研究 被引量:3

SOLID-SILVER-INDUCED EMBRITTLEMENT OF TITANIUM ALLOYS
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摘要 采用慢应变速率试验(SSRT)法并结合断口分析,研究了TC11、Ti-811和TC4三种钛合金的固体银致脆(SSIE)行为,同时对SSIE机制进行了分析。结果表明,在2.4×10-6s-1慢速率拉伸条件下,磁控溅射Ag膜使TC11在450℃以上呈现出较显著的SSIE敏感行为,其SSIE下限温度约为400℃。三种钛合金与Ag箔紧密机械接触,在500℃时均显示很高的SSIE敏感性,敏感程度依TC11、TC4、Ti-811顺序增大。钛合金SSIE敏感性取决于Ag与钛合金表面结合紧密程度及Ag沿钛合金晶界扩散速率。 The solid-silver-induced embrittlement(SSIE)of the titanium alloys TC11(an alpha-beta alloy),Ti-811(an alpha alloy),and TC4(an alpha-beta alloy)has been studied using slow strain rate(tensile)tests(SSRTs).It is found that magnetron sputtered silver film severely embrittles TC11 alloy when tested at a strain rate of about 2.4×10 6 per sec (ε· 1)and temperatures above 450℃.The severity of embrittlement increases with increasing temperature.A onset temperature of about 400℃ exists for SSIE of TC11.The titanium alloys TC11,Ti-811 and TC4 in intimate contact with silver foil also manifests severe embrittlement when tested at ε· 1 and 500℃.The severity of embrittlement increases in the sequence of TC11,TC4,Ti-811 order.SEM analysis shows that (1)the fracture path is both intergranular and transgranular cleavage, (2) surface self-diffusion of silver is the limiting transport mechanism,and (3)crack propagation in SSIE is controlled by both surface self-diffusion of silver and cracking of oxide film at crack tip.
出处 《兵器材料科学与工程》 CAS CSCD 北大核心 1998年第2期42-47,59,共7页 Ordnance Material Science and Engineering
基金 航空基金
关键词 固体银脆 磁控溅射 表面扩散 钛合金 分形 solid silver embrittlement, magnetron sputtering, surface diffusion,titanium alloy, fractal.
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