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采用Gleeble-1500热模拟试验机,在变形温度300~500℃、应变速率0.000 1~0.01 s~(-1)的变形条件下,对SiC颗粒增强7090铝基复合材料进行等温恒应变速率热压缩试验,对热变形行为及微观组织进行研究。结果表明:流变应力的大小与位错在SiC颗粒处的堆积程度有关;随着温度的降低或应变速率的升高,堆积程度越大,使得流变应力增大;当温度为300℃、应变速率为0.01 s~(-1)时,峰值应力达到最大为153.6 MPa;复合材料热压缩后SiC颗粒分布更加均匀;变形温度升高或应变速率降低都会使再结晶晶粒增大。
The Gleeble-1500 thermal simulation test machine was used to carry out isothermal constant strain rate thermal compression of SiC particle-reinforced 7090 aluminum matrix composites under the conditions of deformation temperature of 300 ~ 500 ℃ and strain rate of 0.0001 ~ 0.01 s ~ (-1) Test, the thermal deformation behavior and microstructure research. The results show that the magnitude of flow stress is related to the accumulation of dislocations at SiC particles. With the decrease of temperature or strain rate, the larger the degree of accumulation is, the greater the flow stress is. When the temperature is 300 ℃, When the strain rate is 0.01 s ~ (-1), the maximum peak stress is 153.6 MPa. The distribution of SiC particles is more uniform after hot compression. The deformation temperature increases or the strain rate decreases, the recrystallization grains will increase.