Intermetallic phase evolution and strengthening effect in Al-Mg2Si alloys with different Cu/Ni ratios
Intermetallic phase evolution and strengthening effect in Al-Mg2Si alloys with different Cu/Ni ratios
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DOI：
10.1016/j.matlet.2017.12.067
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发表时间：
2018-03
影响因子：
3
通讯作者：
Yilin Sun;Chong Li;Yong-chang Liu;Liming Yu;Huijun Li
中科院分区：
文献类型：
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作者：
Yilin Sun;Chong Li;Yong-chang Liu;Liming Yu;Huijun Li
Al-15%Mg2Si合金（wt%）与Ni和Cu的微合金化产生了增强的强化响应，增加了硬度，同时由于金属间相的形成和演化也提高了抗拉强度。随着Cu/Ni比的增大，金属间相由Al3Ni或Al3CuNi转变为Al7Cu4Ni， Al3CuNi和Al7Cu4Ni的总体积分数增加到3.51% （1%Ni和5%Cu， Cu/Ni比 = 5）。热稳定的Al3CuNi相和Al7Cu4Ni相相互连接形成链，并倾向于建立一个网络。结果表明，该合金（Cu/Ni比 = 5）在350 ℃时的极限抗拉强度高达132 MPa，比Al-15%Mg2Si合金提高了131.6%。
Microalloying of an Al–15%Mg2Si alloy (wt%) with Ni and Cu produced an enhanced strengthening response, increasing hardness whilst also improving tensile strength due to the formation and evolution of intermetallic phases. With the increase of Cu/Ni ratios, intermetallic phases translate from Al3Ni or Al3CuNi to Al7Cu4Ni, and the total volume fraction of Al3CuNi and Al7Cu4Ni increases to 3.51% (1%Ni and 5%Cu, Cu/Ni ratio = 5). The thermally stable Al3CuNi and Al7Cu4Ni phases are connected to each other forming chains and tend to build up a network. As a result, the ultimate tensile strength (at 350 °C) of the alloy (Cu/Ni ratio = 5) reached up to 132 MPa, 131.6% higher than that of Al–15%Mg2Si alloy.