真空处理和Ti含量对Mo-0.1Zr合金性能与显微

Effect of Vacuum Treatment and Ti Content on the Properties and Microstructure of Mo-0.1Zr Alloy

摘要:

将粉末高能球磨，经压制、预烧、高温烧结和真空处理，制备Mo-0.1Zr(质量分数, 下同)和含有不同Ti含量的Mo-0.1Zr-nTi(n分别为0.4，0.55，0.7，0.9)合金。研究真空处理和Ti含量对Mo-0.1Zr合金性能和组织结构的影响。结果表明，真空处理能够使Mo-0.1Zr合金的性能大大提高，尤其使合金的延伸率达到25.6%，达到甚至超过了锻造态合金的延伸率，合金的断口也由真空处理前的沿晶断裂特征转变为明显的穿晶断裂。Ti的添加，使Mo-0.1Zr合金生成了(Mo,Ti)xOy第二相粒子，第二相粒子存在于晶界之间，并随着Ti添加量的增加而增加，从而使合金的力学性能随Ti添加量的增加而下降

关键词:Mo-Zr合金;沿晶断裂;穿晶断裂;真空处理

Abstract:

In order to reveal the effect of vacuum treatment and Ti content on the properties and microstructure of Mo-0.1Zr alloy, Mo-0.1Zr and Mo-0.1Zr-nTi (n=0.4, 0.55, 0.7 and 0.9) alloys were prepared via powder metallurgy processes and final vacuum treatment was adopted. The result shows that the mechanical properties of Mo-0.1Zr alloy were enhanced greatly by the vacuum treatment, especially the elongation of the alloy (25.6%), much higher than that of the forged Mo alloys. Simultaneously, obvious transgranular fracture was observed on the fracture surface after vacuum treatment instead of the intergranular fracture. It induces the generation of (Mo,Ti)xOy second-phase particles by adding element Ti into the Mo-0.1Zr alloy, which exists in the grain boundaries. With the increase of Ti content, the amount of second-phase particles increases and leads to the reduction of mechanical properties of the alloys

Key words:Mo-Zr alloy; intercrystalline fracture; transcrystalline fracture; vacuum treating