Zr57V36Fe7合金的微结构及活化与吸氢性能

Microstructure and Activation and Hydrogenation Properties of Zr57V36Fe7 Alloy

摘要:

研究了Zr57V36Fe7合金的微观组织及相结构，合金吸氢前微观组织由板条状的固溶体晶粒和不规则的类层片状共晶组织组成，主要吸氢相为ZrV2与α-Zr相，吸氢后生成ZrH1.801和V16Zr8H36.29两种主相。测试了合金的活化性能，在723 K，1 h条件下真空加热后，再经过一次吸氢循环，合金达到最佳活化效果。采用定容法测试了合金吸氢P-C-T（Pressure Composition Temperature）性能，合金有较宽且平坦的吸氢平台，采用范特霍夫方程外推室温平衡压达到10-8 Pa量级。

Abstract:

The microstructure and phase structure of Zr57V36Fe7 alloy were investigated. Activation property of the Zr57V36Fe7 alloy was tested. Hydrogen absorption pressure composition temperature (P-C-T) property was investigated by a pressure reduction method at the temperatures ranging from 673 to 823 K. The results indicate that the microstructures of the alloy before hydrogen absorption are constituted of lath-shaped solid-solution grains and irregular lamellar eutectic structures. The dominant hydriding phases are ZrV2 phase and α-Zr phase. After hydrogen absorption the dominant phases are ZrH1.801 phase and V16Zr8H36.29 phase. The alloy can be fully activated by heating at 723 K for 1 h in vacuum followed by a hydrogen absorption and desorption cycle. P-C-T curve exhibits a wide and flat platform. The thermodynamic parameters of the reaction can be calculated using Van’t Hoff equation. The equilibrium hydrogen pressure can reach the level of 10-8 Pa at room temperature.