织构对Zr-4合金低周寿命的影响

采用XRD测定了Zr-4合金板材的织构，用拉扭试验机分别测试了Zr-4合金板材在室温时轧向（R试样，拉伸轴平行于轧向）和横向（T试样，拉伸轴平行于横向）的低周疲劳性能，用TEM研究了Zr-4合金的疲劳亚结构。结果表明：Zr-4合金板材存在明显的织构：轧向的低周疲劳性能高于横向；在循环变形过程中，只有部分晶粒发生了塑性变形，发生塑性变形的晶粒内存在着许多位错和滑移线，T试样中的位错和滑移线比R试样更稠密。板材织构造成了R试样和T试样的低周疲劳寿命。

Effect of Texture on Low Cycle Fatigue Life of Zr-4 Alloy

Texture was examed using XRD and low cycle fatigue property was analyzed using fatigue tester(25 kN) of MTS809A/T-type for Zr-4 alloy plate at room temperature in rolling direction and transverse direction, respectively, in this paper. Results show that the Zr-4 alloy plate has the obvious texture, and the low cycle fatigue property is better in rolling direction than in transverse direction. During the cycle deformation, only partial grains exhibited plastic deformation, where many dislocations and slip lines existed. The dislocations and slip lines in the deformed gains are denser in transverse direction than that in the rolling direction. The difference of low cycle fatigue lifes for the two samples is due to the texture in the Zr-4 alloy plate.