2091Al－Li合金晶界无析出带的形成及其对应力腐蚀的影响  

FORMATION OF GRAIN BOUNDARY PRECIPITATE FREE ZONES IN 2091 Al-Li ALLOY AND ITS EFFECT ON STRESS CORROSION CRACKING

作　　者：李仁顺[1] 王佐义 

机构地区：[1]哈尔滨工业大学

出　　处：《金属学报》1994年第10期A477-A480,共4页Acta Metallurgica Sinica

摘　　要：用慢应变速率拉伸试验研究不同冷却介质淬火并时效的２０９１合金的应力腐蚀敏感性．用透射电镜观察合金的微观组织．结果表明，晶界无析出带（ＰＦＺ）随淬火速度的提高而变窄；而时效过程中，随着晶界沉淀相的形核和长大，ＰＦＺ逐渐宽化．这说明，时效初期，ＰＦＺ是由空位贫化机制形成的；而伴随时效过程的进行，ＰＦＺ又以溶质贫化机制产生宽化．ＰＦＺ宽度越大，合金应力腐蚀敏感性越大．The stress corrosion cracking (SCC) susceptibility of 2091 Al-Li alloy was studied under tension at slow strain rate by quench aging in various media. TEM observation showed that the grain boundary precipitate free zones (PFZ) narrowed with accelerated quenching rate, yet gradually widened with the nucleation and growth of the grain boundary precipitated phase during aging. An interpretation seems to be given that the PFZ may be formed by a vacancy loss mechanism at initial stage of mechanism during sequent aging. The wider the PFZ is, the more susceptibel the alloy will be to SCC.

关 键 词：晶界无析出带 应力腐蚀 铝锂合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]