【摘要】 试验研究不同挤压温度和挤压比对Al-W合金棒材强度和微观组织的影响。结果表明:热挤压塑性变形能够显著提高Al-W合金棒材的致密度;在一定范围内提高挤压温度,试样在挤压过程中发生动态再结晶现象,晶粒得到显著细化;挤压比的增加使合金变形程度增大,变形流线细密,晶粒细化;在挤压温度540℃、挤压比35情况下得到平均晶粒细小的挤压态Al-W合金棒材,其平均晶粒约为5μm,抗拉强度达到479 N/mm2。并建立Al-W合金棒材的抗拉强度与挤压工艺参数的数学模型,该模型计算值与试验值的相对误差均小于5%,具有一定的工程应用价值。更多还原

【Abstract】 The effects of different extrusion temperatures and ratios on strength and microstructure of Al-W alloy rods were studied in the experiment. The results show that hot extrusion plastic deformation can greatly increase the density of Al-W alloy rods. With extrusion temperature increasing in a certain range,dynamic recrystallization is observed and grain is refined significantly. With extrusion ratio rising,deformation degree is increased,deformation streamline is detailed,and grain is refined. When extrusion temperature is 540℃ and extrusion ratio is 35,the as-extruded Al-W alloy rod with refined grains is obtained,with average grain size of 5 μm and tensile strength of 479 N/mm2. Then the mathematical model of tensile strength and extrusion process parameters is established for Al-W alloy rods. The relative error between the calculated value of the model and the test value is less than 5%,so the model can be contributed to engineering application.更多还原