挤压比(extrusion ratio)是指挤压筒腔的横断面面积同挤压制品总横断面面积之比，也叫挤压系数。挤压比是挤压生产中用于表示金属变形量大小的参数，用λ表示：λ=Ft/ΣF1 式中Ft为锭坯在挤压筒内填充后的横断面积，mm^2；ΣF1为挤压制品的总横断面积，mm^2挤压时金属变形量的大小也可用变形程度ε表示：ε=λ-1
提高挤压比，有利于复合材料性能的提高。
Increasing of extrusion ratio was beneficial to the improvement of mechanical properties of composites.
随着挤压比的增加，抗拉强度和伸长率提高。
With the increasing of extrusion ratio, both tensile strength and extensibility are improved.
采用合理的挤压比，可直接生产性能良好的铝合金导电线材。
So fine aluminum conductor wire can be produced by the proposed process and under proper extrusion ratio.
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