Microstructure and properties of creep aged 2124 aluminum alloy
2010; Science Press; Volume: 20; Issue: 11 Linguagem: Inglês
ISSN
1004-0609
AutoresYunlai Deng, Liang Zhou, Kun Jin, Zhang Xin-ming,
Tópico(s)High Temperature Alloys and Creep
ResumoThe effect of pre-treatment(15% pre-deformation +100 ℃ pre-aging for 5 h)on creep age forming of aluminum alloy 2124 sheets,which can be enhanced by heat treatment,was investigated.The microstructures and properties of two sheets with different pre-treatments were analysed by means of SEM,TEM and measuring the electrical conductivity,Vickers hardness and tensile performance.The results show that the pre-treatment reduces the elongation of the initial stage of creep,but increases the steady-state creep rate;the coarse Fe and Si second phase particles are crushed to certain degree by the pre-treatment,and such coarse particles are further broken down by the subsequent creep stress.The morphology and distribution of the precipitated second phase particles are also improved by pre-treatment.The pre-treated sample depicts higher electrical conductivity,hardness and strength but smaller elongation rate than the non-pre-treated one.
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