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采用Instron 5500万能试验机对Zr_(55.7)Cu_(23)Ni_9Al_(12.3)块体非晶合金进行了应变速率为4×10~(-4)s~(-1)、环境温度为143 K的低温压缩试验,研究了其低温压缩变形行为。结果表明,当测试环境温度从298 K(室温)降低到143 K时,该合金的强度和塑性均呈增加的趋势,且未出现传统晶态材料的冷脆性现象。分析表明,其屈服强度的增加源于低温下剪切带的形核需要更高的载荷,而低温下断口侧面高密度剪切带的形成导致了其塑性的增加。
The strain rate of Zr (55.7) Cu 23 Ni 9 Al 12.3 bulk amorphous alloy was determined to be 4 × 10 -4 s -1 with an Instron 5500 universal testing machine at ambient temperature of 143 K Low temperature compression test, the low temperature compression deformation behavior. The results show that the strength and ductility of the alloy increase with the decrease of the test ambient temperature from 298 K to 143 K, and the cold embrittlement of the conventional crystalline materials does not appear. The analysis shows that the increase of yield strength results from the higher load of the nucleation of the shear band at low temperature, while the formation of high density shear band on the side of the fracture at low temperature leads to the increase of plasticity.