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高比重合金对于实用来说,有密度和机械性能兼优的特点。本文着重研究含钨量为90-99.5%(重量)高比重合金的密度、强度和韧性的变化。研究了性能、工艺和显微结构与钨含量之间的基本关系。当钨含量高时,由于接触性增加,强度和延性降低。断裂观察证明,性能的限度与高接触性有关。高钨高比重合金易受到杂质在钨-基体相界面偏析的影响。因此,高钨高比重合金的机械性能对工艺条件是很敏感的。含钨量一定时,接触性是由二面角确定的。而且,界面的数量随晶粒的尺寸而变化。因此,这两种显微结构的特点与控制机械性能的杂质偏析有关。在本文中指出,对钨含量高达98%(重量)的高钨高比重合金,其强度为850兆帕,延伸率为12%。通过添加微量的合金化元素改变二面角和钨-基体相界面性能而获得更高的性能是完全可能的。
High proportion of alloys for practical purposes, both density and mechanical properties and excellent features. This article focuses on the changes of density, strength and toughness of alloys with high tungsten content of 90-99.5% by weight. The basic relationship between performance, process and microstructure and tungsten content was investigated. When the tungsten content is high, the strength and ductility are reduced due to the increased contact. Fracture observation shows that the limits of performance are related to high contact. High tungsten high specific gravity alloys are susceptible to segregation of impurities at the tungsten-matrix interface. Therefore, the mechanical properties of high tungsten high specific gravity alloy are very sensitive to process conditions. With a certain amount of tungsten, the contact is determined by the dihedral angle. Moreover, the number of interfaces varies with the size of the grains. Therefore, the characteristics of these two microstructures are related to the segregation of impurities that control the mechanical properties. It is pointed out in this paper that for high tungsten high specific gravity alloys with a tungsten content of up to 98% by weight, the strength is 850 MPa and the elongation is 12%. It is entirely possible to obtain higher performance by changing the dihedral angle and the tungsten-matrix interface properties by adding trace amounts of alloying elements.