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用正交试验法探讨了Cu ,Mg ,Mn ,Fe诸元素对ZL10 8合金的热强作用。采用多元回归定量地建立了 4元素及其交互作用与合金 3 0 0℃短时抗拉强度之间的经验公式。该回归方程具有较高的置信度 ,根据化学成分计算出的合金高温抗拉强度与实测结果误差在 5 %以内。讨论了 4元素的热强机理。各元素通过所形成的复杂金属间化合物的热稳定性、形态以及数量实现对合金的热强作用。Mg和Fe显著提高合金的高温强度 ,但Mg量增至 0 .7%以上 ,其热强作用不再明显。Fe量高时 ,Mn出现热强作用。Mn量高时 ,Cu只具有微弱的热强作用。最后提出Cu ,Mg ,Mn ,Fe的最佳范围可以保证合金高温抗拉强度超过国家标准 (78.5MPa)。
The effect of Cu, Mg, Mn, Fe elements on the thermodynamics of ZL10 8 alloy was discussed by orthogonal test. Multiple regression was used to quantitatively establish the empirical formula between 4 elements and their interaction with short-term tensile strength at 300 ℃. The regression equation has a high degree of confidence. The calculated high-temperature tensile strength of the alloy according to the chemical composition is within 5% of the measured value. The thermal mechanism of 4 elements is discussed. Each element achieves a strong thermal effect on the alloy by the thermal stability, morphology and amount of the complex intermetallic compound formed. Mg and Fe significantly improve the high-temperature strength of the alloy, but the amount of Mg increased to 0 .7% or more, the thermal effect is no longer obvious. When Fe is high, Mn shows a strong heat effect. Cu has only a weak thermal effect when Mn is high. Finally, the optimal range of Cu, Mg, Mn and Fe is proposed to ensure that the high temperature tensile strength of the alloy exceeds the national standard (78.5MPa).