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采用单辊甩带法制备了ZK60镁合金薄带,研究了不同条件热处理薄带的组织和显微硬度。结果表明,薄带由晶粒尺寸<8μm的等轴α-Mg、球状β′2相和少量杆状β′1相组成;热处理温度<300℃时,晶粒无长大;温度>300℃时,晶粒显著长大。原始薄带显微硬度约为50HV,300℃×2h热处理后显微硬度值最大约为80HV;β′1和β′2相的弥散强化作用是薄带硬度提高的内在原因。
ZK60 magnesium alloy strip was prepared by single roll rejection method. The microstructure and microhardness of the strip under different conditions were studied. The results show that the ribbons consist of equiaxed α-Mg with a grain size of <8μm, a spherical β’2 phase and a small amount of rod-like β’1 phases. When the annealing temperature is below 300 ℃, When the grain grows significantly. The microhardness of the original thin strip is about 50 HV, and the maximum microhardness value is about 80 HV after 300 ℃ × 2h heat treatment. The dispersion strengthening effect of β’1 and β’2 phases is the intrinsic reason for the increase of strip hardness.