【摘要】 采用激光脉冲方法,每隔0.4 mm对Zr基块体非晶合金Zr53.7Ni9.4Cu28.5Al8.4进行单脉冲激光重熔实验,研究不同晶化区域的组织结构和成分变化等。结果表明,单脉冲激光重熔产生晶化主要发生在一次热影响区与二次热影响区。一次热影响晶化区晶粒为尺寸约5μm的针状晶粒和直径0.6～1.5μm的球状晶粒,晶化相为亚稳相ZrNi和稳态相Zr2Cu、Zr2Al;二次热影响晶化区晶粒为直径约5μm菊花状晶粒,晶化相为稳态相Zr2Al和Zr4Al3;晶化相中Zr原子含量百分比增加,Al、Cu的含量百分比下降,Ni基本不变。结构弛豫现象是引起热影响区的晶化的重要原因。更多还原

【Abstract】 To research the distinction of organizational structure and composition in different crystallized zones,single-pulse laser irradiation was conducted to the Zr53.7Ni9.4Cu28.5Al8.4 bulk metallic glasses(BMG) with 0.4 mm on each interval.SEM,XRD and EDS were used to analysis the microstructure,composition and element distribution of crystallized zones.According to the results,pulse-to-pulse interactions were conducted,the first irradiation was reheated by the second irradiation.So the heat affected zone(HAZ) on both the first pulse irradiation and second pulse irradiation were crystallized.The grains in first pulse irradiation HAZ are Needle-like grains in size of 5 μm and spherical grains with diameter varying from 0.6 μm to 1.5 μm appeared and consist of metastable phase ZrNi and stable phase Zr2Cu,Zr2Al;second pulse irradiation HAZ are Chrysanthemum-like grains with the size of 5 μm with stable phase Zr2Al,Zr4Al3.Moreover,contents of Zr increase,Al and Cu decrease and Ni intact in all crystallization.The most important reason of crystallization is structural relaxation.更多还原