Evolution of iron-rich intermetallics and elevated temperature mechanical properties in gravity die cast 2A16 Al alloy

Evolution of iron-rich intermetallics and elevated temperature mechanical properties in gravity die cast 2A16 Al alloy
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重力铸造2A16铝合金中富铁金属间化合物和高温力学性能的演变

DOI:
10.1080/13640461.2017.1409391
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发表时间:
2017-12
影响因子:
1.4
通讯作者:
WeiWen Zhang
WeiWen Zhang
中科院分区:
材料科学4区
文献类型:
--
作者:
Bo Lin;WeiWen Zhang

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采用扫描电子显微镜、透射电子显微镜、深腐蚀技术和拉伸试验研究了高铁含量0.5wt-%重力压铸2A16合金中富铁金属间化合物的演化和高温力学性能。结果表明,在T7热处理过程中,α-Fe相转变为β-Fe相。新形成的圆柱形β-Fe使其表面积最小化。在高铁含量Al-Cu合金T7热处理过程中,发现α-Fe弥散相存在于α(Al)基体中。在573K的高温下,高铁含量0.5wt-%的2A16合金表现出比工业铝合金更好的拉伸性能,这归因于β-Fe的存在防止了晶界滑移以及纳米α-Fe弥散相在α(Al)中的长期热稳定性。
The evolution of iron-rich intermetallics and the mechanical properties at elevated temperature.in gravity die cast 2A16 alloys with a high Fe content of 0.5 wt-% were investigated using SEM,.TEM, deep etching technique, and tensile test. The results showed that the Chinese script-like.α-Fe transforms to the β-Fe phase during T7 heat treatment. The newly formed β-Fe with a.cylindrical shape minimised their surface area. A nano sized α-Fe dispersoid was found in the.α (Al) matrix in Al–Cu alloys with high Fe content during T7 heat treatment. At the elevated.temperature of 573 K, the 2A16 alloys with high Fe content of 0.5 wt-% showed superior tensile.properties compared to those of the commercial aluminum alloys, and this is attributed to the.prevention of grain boundary sliding resulting from the presence of β-Fe and the long term.thermal stability of nanosized α-Fe dispersoids in the α (Al) matrix.
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