3GPa压力处理对Cu-Zn合金热膨胀系数的影响

Effects of 3GPa Pressure Treatment on the Thermal Expansion of Cu-Zn Alloy

利用膨胀仪测试了Cu-Zn合金在3GPa压力处理前后、25-700℃温度范围内的热膨胀系数；借助金相显微镜、X射线衍射（XRD）及差示扫描量热分析（DSC）技术，对高压处理前后合金的金相组织及相变进行了分析。在此基础上，探讨了高压处理对Cu—Zn合金热膨胀性能的影响。结果表明：高压处理能增大Cu—Zn合金的热膨胀系数，改变热膨胀系数随温度的变化规律，当温度为535．14℃时，热膨胀系数呈现高峰值，较同等温度未经高压处理的Cu—Zn合金的热膨胀系数增大了49．48％。

The coefficients of thermal expansion of Cu-Zn alloy between 25-700 ℃, which was before and after 3 GPa high-pressure treatment, were measured by the DIL402C thermal expansion instru- ment. In addition,the metallurgical microscope,X-ray diffraction （XRD）,and differential scanning calorimetry （DSC） were employed to characterize the microstructures and phase transformation of the al- loy. Based on the experimental results, the effects of high-pressure treatment on the thermal expansion of Cu-Zn alloy were investigated. The high-pressure treatment can obviously increase the thermal ex- pansivity of Cu-Zn alloy and change the trend of the thermal expansion curve. At 535.14 ℃ ,the thermal expansion curve after the high-pressure treatment reaches its peak value, which is 49.48% larger than the untreated alloy.