徐道芬1,2,陈康华1,3?覮,陈运强1,邢军1,陈送义1,李晓谦1.Fe对2219铝合金锻件组织与性能的影响[J].湖南大学学报:自然科学版,2020,(6):116~124
Fe对2219铝合金锻件组织与性能的影响
Effect of Fe on Microstructure and Propertiesof 2219 Aluminum Alloy Forgings
  
DOI:
中文关键词:  2219铝合金  Fe  显微组织  力学性能  腐蚀行为
英文关键词:2219 aluminum alloy  Fe  microstructures  mechanical property  corrosion behavior
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作者单位
徐道芬1,2,陈康华1,3?覮,陈运强1,邢军1,陈送义1,李晓谦1 (1. 中南大学 轻合金研究院湖南 长沙 4100832. 桂林航天工业学院 机械工程学院广西 桂林 541004 3. 中南大学 粉末冶金国家重点实验室湖南 长沙 410083) 
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中文摘要:
      采用超声半连续铸造方法制备了3种不同杂质Fe质量分数的2219铝合金铸锭,并结合OM、SEM、力学拉伸实验、电化学实验等分析测试方法,研究了Fe质量分数对2219铝合金组织和性能的影响. 结果表明,当Fe元素超过一定质量分数后,有Al7Cu2(FeMn)相析出,且残余结晶相体积分数增加,导致合金强塑性与耐腐蚀性能下降. 2219铝合金的室温断裂行为主要由Al7Cu2(FeMn)相的脆断、Al2Cu相在锻造过程中所形成的裂纹源扩展方向及粗大结晶相与基体界面结合强度低三方面因素综合影响.
英文摘要:
      Three kinds of 2219 aluminum alloy with different iron Fe mass fractions were produced by ultrasonic semi-continuous casting method. The influence of Fe mass fraction on microstructure and properties of 2219 aluminum alloy was investigated by OM, SEM, tensile tests and electrochemical corrosion experiment. The results showed that the mechanical properties and corrosion resistance decreased obviously with the increase of Fe mass fraction, which was attributed to the generation of massive primary Al7Cu2(FeMn) phase and the increase of volume fraction of residual crystalline phases. The tensile fracture behavior of 2219 aluminum alloy at room temperature was mainly influenced by the brittle fracture of Al7Cu2(FeMn) phase, the crack direction of Al2Cu phase formed in the forging process and the low bonding strength at coarse residual crystalline phase/ Al matrix interfaces.
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