Development of Al-Cu-Mg-Li (Mn,Zr,Sc) alloys for age-forming
Development of Al-Cu-Mg-Li (Mn,Zr,Sc) alloys for age-forming
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时效成形用 Al-Cu-Mg-Li (Mn,Zr,Sc) 合金的开发
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Gardiner
中科院分区：
文献类型：
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作者：
N. Kamp;M. Starink;I. Sinclair;N. Gao;P. Gregson;P. Pitcher;S. Gardiner
民用机身下机翼蒙皮结构的时效成形需要具有良好时效成形性和机械性能（屈服强度、极限拉伸强度、抗疲劳性、韧性）的合金。利用属性建模和一般冶金知识，设计了一系列 Al-Cu-Mg-Li（Mn、Zr、Sc）合金。在代表时效形成的人工时效之后，几种新设计的合金的屈服强度、抗疲劳裂纹扩展性和韧性至少与此类应用中现有的耐损伤材料相当，即： 2024-T351。粗晶粒结构和高锂含量被认为与良好的抗疲劳性有关，但降低了可成形性，需要寻求最佳平衡。
Age forming of lower wing skin structures for civil airframes requires an alloy with good age formability and mechanical properties (yield strength, ultimate tensile strength, fatigue resistance, toughness). Using property modelling and general metallurgical understanding, a series of Al-Cu-Mg-Li (Mn, Zr, Sc) alloys have been designed. After artificial ageing representative of age-forming several of the newly designed alloys have yield strength, fatigue crack growth resistance and toughness that are at least comparable to the incumbent damage tolerant material for such applications, viz. 2024-T351. Coarse grain structure and high Li content are seen to be associated with good fatigue resistance but reduced formability, and an optimum balance needs to be sought.