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2A14鋁合金擠壓棒材的熱處理工藝
發(fā)布人：上海艾荔艾金屬材料有限公司www.85978597.cn
更新時間：2015-07-27
采用顯微硬度測試、電導率測試、拉伸力學性能測試以及透射電鏡觀察，研究時效溫度和時效時間對2A14大規(guī)格鋁合金棒材力學性能和電導率的影響規(guī)律。
2A14鋁合金擠壓棒材的熱處理工藝Heat treatment technology of 2A14 alloy extruded bar
采用顯微硬度測試、電導率測試、拉伸力學性能測試以及透射電鏡觀察，研究時效溫度和時效時間對2A14大規(guī)格鋁合金棒材力學性能和電導率的影響規(guī)律。結果表明：在相同的時效時間下，合金電導率隨時效溫度升高而逐漸升高；在相同的時效溫度下，合金電導率隨時效時間的延長而逐漸升高。固溶態(tài)2A14合金中存在與Al6Mn晶體結構相近的Al12(MnCu)3Si2粒子，此Al12(MnCu)3Si2粒子在合金再結晶過程中影響晶界遷移，抑制晶粒在固溶過程中的長大效應；時效后，合金中主要的強化相為S''''相，但在140
℃(或低于400 ℃)時效12 h的合金中，強化相數(shù)量較少，合金性能與固溶態(tài)接近；經160 ℃、12
h時效后，合金具有較好的綜合力學性能，其抗拉強度和屈服強度分別為509 MPa和452 MPa，伸長率為10.1%；在180 ℃、12
h時效條件下處理后，合金中的S''''相會明顯粗化，屈服強度和抗拉強度大幅下降，伸長率升高，表現(xiàn)出明顯的過時效特征。
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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