Zr46.9Cu45.5Al5.6Y2.0金属玻璃含B2-CuZr相内生复合材料的制备及其力学性能*
PREPARATION AND MECHANICAL PROPERTIES OF Zr46.9Cu45.5Al5.6Y2.0 IN SITU BMG COMPOSITES WITH B2-CuZr PHASE
Online published: 2015-07-16
Supported by
Supported by National Natural Science Foundation of China (No.51171180)
通过增大铸造棒材直径来调整熔体的冷却速率, 可在Zr46.9Cu45.5Al5.6Y2.0块体金属玻璃(BMG)中获得体积分数可变化的球形B2-CuZr相均匀分布于金属玻璃基体、并且具有较大尺寸的内生复合材料, 其中含25%B2-CuZr相(体积分数)复合材料在压缩载荷下的塑性应变由单相金属玻璃的1.6%增大至6.5%, 但在单向拉伸时样品没有观察到明显的延性应变. 分析认为, 复合材料在拉伸载荷下发生脆性断裂的本征原因在于CuZr相晶粒尺寸和间距与金属玻璃基体塑性区尺寸不满足尺寸匹配关系. 在ZrCuAl合金中添加2%Y (原子分数)严重损伤了金属玻璃基体的断裂韧性和塑性区尺寸, 与Zr46.9Cu45.5Al5.6Y2.0 BMG相比, 不含Y的Zr48Cu45Al7 BMG样品可预制疲劳裂纹, 三点弯曲实验测得断裂韧性为(62±3) MPam1/2, 平面应变条件下在裂纹尖端的塑性区尺寸可达150 mm.
沈勇,徐坚 . Zr46.9Cu45.5Al5.6Y2.0金属玻璃含B2-CuZr相内生复合材料的制备及其力学性能*[J]. 金属学报, 2015 , 51(11) : 1407 -1415 . DOI: 10.11900/0412.1961.2015.00140
Bulk metallic glass (BMG) composites containing B2-CuZr phase are of interest due to they behave large plastic strain and apparent work hardening in tension. Nevertheless till now most BMG composites containing B2-CuZr phase are based on Cu47.5Zr47.5Al5 or Zr48Cu47.5Al4Co0.5 BMG, which has limited glass forming ability (GFA). The prepared sample size is small, which restricts their potential engineering structural applications. In this work, Zr-Cu-Al-Y quaternary system is selected due to its high GFA. By tuning composition close to CuZr alloy in Zr-Cu-Al-Y quaternary system, Zr46.9Cu45.5Al5.6Y2.0 BMG is selected because it has proper GFA (critical diameter Dc=5 mm) and relatively large fracture toughness (KQ=(49±3) MPam1/2). By decreasing the cooling rates of the melt via increasing diameter of casting rods, large-sized in situ Zr46.9Cu45.5Al5.6Y2.0 BMG composites containing 13% and 25% volume fractions spherical B2-CuZr phase were prepared in the casting rods with 6 and 7 mm in diameters, respectively. In compression testing, the in situ BMG composites containing 25%B2-CuZr phase promote multiple shear bands within glass matrix and remarkable global plastic deformation, accompanied by a large compressive plastic strain as 6.5%. Nevertheless in tension testing no obvious global ductility was achieved, which attributes to the low mode I fracture toughness and small plastic zone size (RP=88 mm, RP=(1/3π)(KQ/sy)2 ) of glass matrix. Three point bending test results show that Y has an adverse effect on the fracture toughness and plastic zone size of Zr-Cu-Al BMGs. In contrast to Zr46.9Cu45.5Al5.6Y2.0 BMG, fatigue pre-cracked Zr48Cu45Al7 BMG plate samples can be prepared and exhibit a high fracture toughness (KQ=(62±3) MPam1/2) and a large plastic zone size (RP=150 mm) in plane strain state. Our results show that GFA and fracture toughness of glass matrix should be balanced when designing new BMG composites containing B2-CuZr phase.
Key words： bulk metallic glass; composite; B2-CuZr; fracture toughness
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