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采用金相、X射线衍射(XRD)、透射电镜(TEM)、硬度测定和拉伸试验研究了高温热暴露对快速凝固AlCrYZr合金显微组织影响和高温下力学性能的热稳定性,结果表明,快速凝固AlCrYZr合金主要第二相为Al20Cr2Y(立方,a=1437nm)和DO23Al3Zr(正方,a=04013nm,c=1732nm),Al20Cr2Y在500℃热暴露尚能保持其立方结构,但质点明显粗化,甚至块状化,在粗大的Al20Cr2Y相中存在有层错和孪晶结构。合金固溶体在退火过程中可能出现Ll2Al3Zr,硬度有所提高。从合金组织性能来看,实验合金至少在350℃以下可以稳定使用。
The effects of high temperature heat exposure on the microstructure of rapidly solidified AlCrYZr alloy and the thermal stability of the mechanical properties at high temperature were investigated by metallography, XRD, TEM, hardness measurement and tensile test. The main second phases of AlCrYZr alloy with rapid solidification are Al20Cr2Y (cubic, a = 1437nm) and DO23Al3Zr (square, a = 04013nm, c = 1732nm). Al20Cr2Y still maintains its cubic structure with thermal exposure at 500 ℃, Even bulk, there are layer faults and twin structures in the coarse Al20Cr2Y phase. Alloy solid solution in the annealing process may appear Ll2Al3Zr, hardness increased. From the perspective of alloy performance, the experimental alloy can be used stably at least below 350 ° C.