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深空环境中复杂的高低温交变温度场会对稀土镁合金构件的力学性能和服役寿命产生显著影响,然而相关研究还少见报道。鉴于此,对固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr镁合金进行了不同次数的高低温循环热处理(-196℃×45 min→196℃×45 min),采用X射线衍射仪(XRD)、场发射扫描电镜(SEM)和室温单轴压缩实验等研究了高低温循环热处理对其力学性能和微观组织演化的影响。结果表明:在经历0次(0C)、1次(1C)、6次(6C)、20次(20C)高低温循环热处理后,试样的LPSO相体积分数分别为10.00%、10.45%、9.86%和10.71%,说明循环次数对于LPSO相体积分数影响可忽略不计;循环次数会影响合金中基面峰、柱面峰和锥面峰的峰强度,这说明合金在高低温循环热处理过程中会发生部分晶粒区域的取向转动;0C、1C、6C和20C样品的屈服强度分别为322、249、263和316 MPa,极限抗压强度分别为552、620、670和645 MPa,断裂伸长率分别为8.02%、11.21%、10.76%和8.11%;上述力学性能的变化,与不同循环次数高低温循环热处理中,Mg-10Gd-6Y-1.5Zn-0.5Zr镁合金的整体位错密度变化、晶粒晶界附近以及LPSO相和基体界面位置处几何必要位错(Geometrically necessary dislocation, GND)变化密切相关。
Abstract：The complex and alternating high-low temperature fields in deep space environment can have a significant effect on the mechanical properties and service life of rare earth magnesium alloy components, but there are few reports on related research. In view of this, the solution treated Mg-10Gd-6Y-1. 5Zn-0. 5Zr magnesium alloy was subjected to different cycles of high and low temperature cycle heat treatment(-196 ℃ ×45 min → 196 ℃ ×45 min). The effect of high and low temperature cycle heat treatment on its mechanical properties and microstructure evolution was studied using X-ray diffraction(XRD), field emission scanning electron microscopy(SEM),and room temperature uniaxial compression experiments. The results show that after undergoing 0 cycles(0C), 1 cycle(1C), 6 cycles(6C), and 20 cycles(20C) of high and low temperature cycle heat treatment, the volume fractions of long period stacking ordered(LPSO) phase in the samples are 10. 00%, 10. 45%, 9. 86%, and 10. 71%, respectively, indicating that the effect of cycle times on the volume fraction of LPSO phase is negligible. The cycle times will affect the peak intensity of the basal peak, prismatic peak and pyramidal peak of the alloy, indicating that the alloy undergoes orientation rotation in specific grain regions during high and low temperature cyclic heat treatment. The yield strength of the 0C, 1C, 6C, and 20C samples is 322 MPa, 249 MPa, 263 MPa, and 316 MPa, respectively;the ultimate compressive strength is 552 MPa, 620 MPa, 670 MPa, and 645 MPa, respectively; and the fracture elongation is 8. 02%,11. 21%, 10. 76%, and 8. 11%, respectively. The aforementioned changes in the mechanical properties are closely related to variations in the overall dislocation density of the Mg-10Gd-6Y-1. 5Zn-0. 5Zr magnesium alloy, as well as the evolution of the geometrically necessary dislocations(GNDs) near grain boundaries and at the LPSO phase/matrix interface during different cycles of high and low temperature cyclic heat treatment.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0573
中图分类号:TG146.22;TG156
引用信息:
[1]苗天虎,龚海,王力等.高低温循环热处理对固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr镁合金力学性能与微观组织的影响[J].材料热处理学报,2025,46(09):60-67.DOI:10.13289/j.issn.1009-6264.2024-0573.
基金信息:
重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX0252); 重庆理工大学科研创新团队培育计划项目(2023TDZ010);重庆理工大学校级研究生创新项目(gzlcx20232013);重庆理工大学大学生创新创业训练计划(26)