Effects of natural aging and heat treatments conditions on mechanical properties of dissimilar composite between 6061 Al alloy and Al-Sil2CuNi(AC8A)AI cast alloy fabricated by friction weldig
Effects of natural aging and heat treatments conditions on mechanical properties of dissimilar composite between 6061 Al alloy and Al-Sil2CuNi(AC8A)AI cast alloy fabricated by friction weldig
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自然时效和热处理条件对摩擦焊6061铝合金与Al-Sil2CuNi(AC8A)AI铸造合金异种复合材料力学性能的影响
DOI：
10.1007/s10999-017-9391-4
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Takahashi
中科院分区：
文献类型：
--
作者：
M. Kimura;H. Sakaguchi;M. Kusaka;K. Kaizu;T. Takahashi
本文研究了自然时效和热处理条件对摩擦焊接制备的6061铝合金（AA6061）与Al- si12cuni (AC8A) Al铸造合金异种复合材料力学性能的影响。异种复合材料由外径为30.0 mm、内径为24.0 mm的管件组成。该复合材料在两种材料界面的相邻区域存在软化区。随着自然时效时间的延长，复合材料两侧的软化区硬度逐渐恢复，自然时效时间为35天（1个月）及以上的软化区基本相同。自然时效35 d的复合材料（AW复合材料）的抗拉强度约为AC8A母材的62%。断裂点为界面在AC8A侧的邻区，即软化区。在每种母材的T6条件下再处理的AW复合材料的软化区也得到了恢复。这些复合材料的抗拉强度约为AC8A母材的58%，而那些从AC8A侧内径的角落部分断裂的复合材料。另外，在加热温度为473 K的高温环境下，对AC8A母材进行T6条件再处理的复合材料，在AC8A侧内径角处发生断裂。即复合材料的界面紧密结合。通过实验方法，获得了摩擦焊接复合材料作为发动机活塞的可能性，因为该复合材料没有从界面处断裂。
This paper describes the effects of natural aging and heat treatments conditions on mechanical properties of dissimilar composite between 6061 Al alloy (AA6061) and Al-Si12CuNi (AC8A) Al cast alloy, which was fabricated by friction welding. The dissimilar composite was composed of specimens with the pipe part which had an outer diameter of 30.0 mm and an inner diameter of 24.0 mm. This composite had the softened region at the adjacent region of the interface of both materials. The softened region of both sides of the composite recovered the hardness with increasing natural aging time, and those with a natural aging time of 35 days (1 month) or longer had almost similar softened region. Then, the composite with a natural aging time of 35 days (AW composite) had approximately 62% in the tensile strength of the AC8A base metal. The fractured point was the adjacent region of the interface at the AC8A side, i.e. the softened region. The softened region of AW composites, which were re-treated with T6 condition of each base metal, was also recovered. Those composites had approximately 58% in the tensile strength of the AC8A base metal, and those fractured from the corner part of the inner diameter in the AC8A side. In addition, the composite with the high temperature environment with a heating temperature of 473 K, which was re-treated with T6 condition of the AC8A base metal, fractured from the corner part of the inner diameter in the AC8A side. That is, the interface of the composite tightly joined. The possibility that can use the composite fabricated by friction welding as an engine piston was obtained by experimental approach, because the composite did not have the fracture from the interface.