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首页> 外文会议>Light metals 2012. >THE INFLUENCE OF SOLUTION TREATMENT ON THE HIGH-TEMPERATURE STRENGTH OF AL-SI FOUNDRY ALLOYS WITH NI
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THE INFLUENCE OF SOLUTION TREATMENT ON THE HIGH-TEMPERATURE STRENGTH OF AL-SI FOUNDRY ALLOYS WITH NI

机译：固溶处理对含Al的Al-SI铸造合金高温强度的影响

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摘要

Al-Si-Ni alloys can be considered as a coarse two-phase systemrnwhere a hardening effect is caused by load transfer to anrninterconnected rigid network of eutectic Si and aluminides. In therncourse of a solution treatment the contiguity of the eutectic phasernis reduced, which leads to a decrease of strength.rnHowever, solution treatment is necessary to obtain a highrnsupersaturation of elements in the Al-solid solution, whichrncontribute to high-temperature strength due to precipitationrnhardening. Despite Ostwald ripening, the distribution ofrnsecondary precipitates is still dense enough to act as dislocationrnobstacles, as was confirmed by TEM-analysis.rnThis work discusses the influence of heat treatments on thernelevated-temperature strength of Al-Si foundry alloys with Ni andrnanalyzes the active strengthening mechanisms. In order torninvestigate the effect of a solution treatment on the hightemperaturernstrength of Ni-containing Al-Si foundry alloys, therntensile properties of various eutectic alloys were determined atrn250°C after long-time exposure to test temperature.
机译：Al-Si-Ni合金可以看作是粗糙的两相系统，其中硬化效应是由于载荷转移到共晶Si和铝化物的相互连接的刚性网络中而引起的。在固溶处理过程中，共晶相的连续性降低，从而导致强度降低。然而，固溶处理对于获得铝固溶体中元素的高过饱和度是必需的，这会由于沉淀硬化而导致高温强度。 。尽管经过奥斯特瓦尔德（Ostwald）熟化，二次沉积物的分布仍然致密，足以作为位错障碍，正如TEM分析所证实的那样。机制。为了研究固溶处理对含Ni的Al-Si铸造合金高温强度的影响，在长时间暴露于测试温度下于250°C时测定了各种低共熔合金的拉伸性能。

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