论文部分内容阅读
采用脉冲电流预处理外加等温退火,制备得到了具有不同晶化分数的Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5)块体非晶基复相材料,并通过X射线衍射法和差示扫描量热法分析材料析出的物相及其晶化分数,通过显微硬度、单轴压缩实验和扫描电子显微镜(SEM)研究材料的力学性能演变.结果表明:经处理后的合金首先析出准晶相,然后析出Be_2Zr,Zr_2Cu和FCC等物相;在晶化初期,合金的断裂强度和塑性应变量随晶化分数的增加而增加,当晶化分数为8.2%时,塑性变形量达6.3%.当晶化分数进一步增加时,断裂强度和塑性变形量均快速降低.扫描电子显微镜观察分析结果表明,随晶化分数的增加,合金的断裂模式则由剪切断裂转变为劈裂和解理脆性断裂.实验结果表明通过控制退火时间等参数可优化块体非晶基复相材料的力学性能.
A series of Zr_ (41) Ti_ (14) Cu_ (12.5) Ni_ (10) Be_ (22.5) bulk amorphous matrix composites with different crystallization fraction were prepared by pulse current pretreatment and isothermal annealing. Ray diffraction and differential scanning calorimetry, the mechanical properties of the material were investigated by microhardness, uniaxial compression and scanning electron microscopy (SEM). The results showed that: after treatment After the first precipitation of the quasicrystalline phase, and then precipitated Be_2Zr, Zr_2Cu and FCC and other phases; early in the crystallization, the alloy fracture strength and plastic strain increases with the increase of the crystallization fraction, when the crystallization fraction of 8.2% , The amount of plastic deformation reaches 6.3% .When the crystallization fraction increases further, the breaking strength and the plastic deformation amount decrease rapidly.The result of SEM shows that with the increase of crystallization fraction, the fracture mode of the alloy is composed of shear fracture To cleave and cleave brittle fracture.The experimental results show that the mechanical properties of bulk amorphous matrix composites can be optimized by controlling parameters such as annealing time.