镁合金单轴拉伸微蠕变测量系统

SINGLE AXLE TENSILE MEASUREMENT SYSTEM OF MICROCREEP FOR MAGNESIUM ALLOY

为了准确测出镁合金抗微蠕变性能,采用单轴拉伸法对镁合金进行室温蠕变试验,开发了镁合金微蠕变测量系统,解决了测量微蠕变关键技术问题,提出采用高精度位移传感器、恒温箱、测量放大器以及设计专用蠕变变形测量装置,构成镁合金微蠕变测试系统。试验结果表明,该系统精度高、性能稳定,可精确测试镁合金室温蠕变稳态速率和应变量,镁合金ZM6室温(35℃)下的蠕变应变为0.02%,最小稳态蠕变应变速率为10-10s-1。

In order to improve mieroereep resistance for magnesium alloy, room-ftemperature creep test Ior magnesium alloy used the single axle tensile method was researched, and the measurement system of creep testing machine was studied, and then technical method of micro-creep precise measurement for magnesium alloy was solved. High-accuracy displacement sensor, constant temperature cabinet, measurement amplifier and special creep deformation measurement mechanism were designed to compose the measurement system of microcreep for magnesi- um alloy. The tested results were that the system with high-accuracy and steady performance could accurately meas- ure steady-state creep speed rate for magnesium alloy in room-temperature and strain capacity, and then micro-creep strain for magnesium alloy ZM6 was about 0.02% in the room-temperature（35~C）, and its minimum steady-state creep strain speed rate was about 10^-10 s^-1.