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Influence of Cu and Mg Addition on Mechanical Properties and Thermal Fatigue Life of Al-Si-Mg Cast Alloys for Cylinder Head

机译:Cu和Mg添加对汽缸盖的Al-Si-Mg铸造合金机械性能和热疲劳寿命的影响

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摘要

As an attempt to optimize materials for diesel engine cylinder heads, the chemical composition and heat treatment procedure of Al-Si-Mg alloy were studied. The relation between additional elements and mechanical properties (tensile strength and elongation) was investigated on AC4C aluminum alloys containing additional Cu or Mg, and the optimum chemical composition was determined. In composition ranges within 0.6 mass percent Mg or 1.0 mass percent Cu, it was found that Cu or Mg addition increased tensile strength without deterioration of elongation, and also increased high cycle fatigue strength. However, thermal fatigue tests indicated that Cu addition affected thermal fatigue life. Especially thermal fatigue life markedly decreased with increasing plastic strain. In addition, excessive aging of Cu addition alloys resulted in increased thermal fatigue life. This is because the thermal fatigue life corresponding to plastic strain increases in excessively aged alloy.
机译:作为优化柴油发动机缸盖的材料的尝试,研究了Al-Si-Mg合金的化学成分和热处理程序。 研究了含有另外的Cu或Mg的AC4C铝合金的附加元件和机械性能(拉伸强度和伸长率)之间的关系,并测定最佳化学组成。 在0.6质量%Mg或1.0质量%的Cu内的组合物中,发现Cu或Mg加入增加的拉伸强度而不会劣化伸长,并且还增加了高循环疲劳强度。 然而,热疲劳试验表明Cu添加影响的热疲劳寿命。 特别是随着塑性菌株的增加,热疲劳寿命显着降低。 此外,Cu加成合金的过度老化导致热疲劳寿命增加。 这是因为对应于塑性应变的热疲劳寿命在过老化的合金中增加。

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