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采用Gleeble-1500热模拟机对喷射成形8009耐热铝合金进行热压缩试验研究,观察该合金在热压缩变形中的流变应力行为。通过透射电镜对压缩合金的组织进行观察,X射线衍射仪对合金中的相进行确定。结果表明,喷射成形8009耐热铝合金是正应变速率敏感材料。在应变速率为0.01 s-1、应变温度为420℃条件下,材料的正应力水平在110~130 MPa范围内,因此在420℃下进行热加工时,施加的应力应当高于130 MPa。沉积态8009耐热铝合金分别在380℃、420℃、460℃,0.01 s-1的应变速率压缩后,合金中的相相近,主要包括α-Al和体心立方结构的α-Al12(Fe,V)3Si相,同时合金中还包含少量的θ-Al13Fe4相,Al9FeSi3相和Al12Fe3Si相。
The thermal compression test of 8009 heat-resistant aluminum alloy spray-formed by Gleeble-1500 thermal simulator was carried out. The flow stress behavior of the alloy during hot compression deformation was observed. The microstructure of the compressed alloy was observed by transmission electron microscopy, and the phase in the alloy was determined by X-ray diffractometer. The results show that spray forming 8009 heat-resistant aluminum alloy is positive strain rate sensitive material. The normal stress level of the material is in the range of 110-130 MPa at a strain rate of 0.01 s-1 and a strain temperature of 420 ° C. Therefore, the thermal stress applied at 420 ° C should be higher than 130 MPa. After the 8009 heat-resisting aluminum alloy was compressed at the strain rates of 380 ℃, 420 ℃, 460 ℃ and 0.01 s-1 respectively, the phases in the alloy were similar and mainly consisted of α-Al and the body-centered cubic α-Al12 (Fe , V) 3Si phase, while the alloy also contains a small amount of θ-Al13Fe4 phase, Al9FeSi3 phase and Al12Fe3Si phase.