Microstructure formed in the Fe-Ni-Co-Al-Cu-Ti permanent magnetic alloy with different treatments was studied by means of TEM observation, XRD method and SAXS technology. The results indicated that spinodal decomposi...Microstructure formed in the Fe-Ni-Co-Al-Cu-Ti permanent magnetic alloy with different treatments was studied by means of TEM observation, XRD method and SAXS technology. The results indicated that spinodal decomposition and orderiing transformation coexisted in the alloy and spinodal decomposition was completed in a short time. The ratio of component of spinodal and ordered microstructure was dependent on the cooling rate. The variation of gyration radius RG of the rod-like precipitates could be accounted for by the different growth modes of the precipitates related to strain energy and interface energy.展开更多
采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机...采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机研究了钎焊接头的力学性能和微观组织结构。结果表明,钛含量的增加明显提高Ag-Cu-Ti钎料与Al_2O_3陶瓷的相互作用,在Al_2O_3/Ag-Cu-Ti界面生成一层由Ti-Al和Ti-O化合物组成的反应层。Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头的抗拉强度随钛含量的增加而增加,当钛含量提高到8%(质量分数)时,抗拉强度达到最大值78 MPa。通过微观组织结构分析发现,采用AgCu4Ti在890℃保温5 min的条件下可以获得较好的钎焊接头,典型接头的微观组织结构为Al_2O_3/TiAl+Ti_3O_5/NiTi+Cu_3Ti+Ag(s,s)/Ag(s,s)+Cu(s,s)+(Cu,Ni)/Fe-Ni-Co。采用Ag-Cu-8Ti获得的钎焊接头的界面反应层与Ag-Cu-4Ti差异不大,但反应层稍微增厚,并伴有TiO和Ti_3Al在Al_2O_3/Ag-Cu-Ti界面生成。展开更多
文摘Microstructure formed in the Fe-Ni-Co-Al-Cu-Ti permanent magnetic alloy with different treatments was studied by means of TEM observation, XRD method and SAXS technology. The results indicated that spinodal decomposition and orderiing transformation coexisted in the alloy and spinodal decomposition was completed in a short time. The ratio of component of spinodal and ordered microstructure was dependent on the cooling rate. The variation of gyration radius RG of the rod-like precipitates could be accounted for by the different growth modes of the precipitates related to strain energy and interface energy.
文摘采用Ag Cu Ti钎料实现了Al_2O_3陶瓷与Fe-Co-Ni合金的钎焊连接,并调查了不同钛含量的钎料对Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头机械性能和微观组织结构的影响。利用扫描电镜(SEM),X射线能量谱仪(EDS),X射线衍射仪(XRD)及电子万能试验机研究了钎焊接头的力学性能和微观组织结构。结果表明,钛含量的增加明显提高Ag-Cu-Ti钎料与Al_2O_3陶瓷的相互作用,在Al_2O_3/Ag-Cu-Ti界面生成一层由Ti-Al和Ti-O化合物组成的反应层。Al_2O_3/Ag-Cu-Ti/Fe-Ni-Co钎焊接头的抗拉强度随钛含量的增加而增加,当钛含量提高到8%(质量分数)时,抗拉强度达到最大值78 MPa。通过微观组织结构分析发现,采用AgCu4Ti在890℃保温5 min的条件下可以获得较好的钎焊接头,典型接头的微观组织结构为Al_2O_3/TiAl+Ti_3O_5/NiTi+Cu_3Ti+Ag(s,s)/Ag(s,s)+Cu(s,s)+(Cu,Ni)/Fe-Ni-Co。采用Ag-Cu-8Ti获得的钎焊接头的界面反应层与Ag-Cu-4Ti差异不大,但反应层稍微增厚,并伴有TiO和Ti_3Al在Al_2O_3/Ag-Cu-Ti界面生成。