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2A14铝合金挤压棒材的热处理工艺
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-07-27
采用显微硬度测试、电导率测试、拉伸力学性能测试以及透射电镜观察，研究时效温度和时效时间对2A14大规格铝合金棒材力学性能和电导率的影响规律。
2A14铝合金挤压棒材的热处理工艺Heat treatment technology of 2A14 alloy extruded bar
采用显微硬度测试、电导率测试、拉伸力学性能测试以及透射电镜观察，研究时效温度和时效时间对2A14大规格铝合金棒材力学性能和电导率的影响规律。结果表明：在相同的时效时间下，合金电导率随时效温度升高而逐渐升高；在相同的时效温度下，合金电导率随时效时间的延长而逐渐升高。固溶态2A14合金中存在与Al6Mn晶体结构相近的Al12(MnCu)3Si2粒子，此Al12(MnCu)3Si2粒子在合金再结晶过程中影响晶界迁移，抑制晶粒在固溶过程中的长大效应；时效后，合金中主要的强化相为S''''相，但在140
℃(或低于400 ℃)时效12 h的合金中，强化相数量较少，合金性能与固溶态接近；经160 ℃、12
h时效后，合金具有较好的综合力学性能，其抗拉强度和屈服强度分别为509 MPa和452 MPa，伸长率为10.1%；在180 ℃、12
h时效条件下处理后，合金中的S''''相会明显粗化，屈服强度和抗拉强度大幅下降，伸长率升高，表现出明显的过时效特征。
The effects of aging temperature and aging time on the
mechanical properties and electrical conductivity of 2A14 aluminum alloy were
investigated by microhardness test, electrical conductivity test, tensile test
and transmission electron microscopy (TEM). The results show that the electrical
conductivity of the sample increases gradually with increasing temperature or
aging time when the aging time or aging temperature are constant. The
Al12(MnCu)3Si2 particles found in the solid
solution 2A14 alloy has a similar crystal structure with Al6Mn, the
Al12(MnCu)3Si2 particles affect the migration
of grain boundary during recrystalline process and restrain the grain growth
during solid solution. For the 2A14 alloy, the S'''' phase is the mainly
strengthening precipitates. However, for the sample aged at 140 ℃ (or lower than
140 ℃) for 12 h, the mechanical properties are close to the sample in
solution-treated condition due to less strengthening phase. After aging at 160 ℃
for 12 h, the alloy shows better combination mechanical properties, the ultimate
tensile strength (UTS), yield strength (YS) and elongation are 509 MPa, 452 MPa
and 10.1%, respectively. After aging at 180 ℃ for 12 h, with the increase of
aging temperature and extension of aging time, the precipitate size of S''''
phase increases and the mechanical properties decrease obviously, which is a
typical phenomena of over aging.
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