定向凝固制备内生晶体增塑的锆基非晶复合材料

SYNTHESIS OF PLASTIC Zr-BASED BULK METALLIC GLASS WITH CRYSTAL PHASE BY DIRECTIONAL SOLIDIFICATION

通过Bridgman定向凝固成功制备了成分为Zr_(58.5)Ti_(14.3)Nb_(5.2)Cu_(6.1)Ni_(4.9)Be_(11.0)的内生枝晶增塑的非晶复合材料.内生枝晶的尺寸和体积分数可以经抽拉速度的改变得以控制,进而实现了对其力学性能的调节.研究表明,枝晶的大小与抽拉速度呈线性关系,体现出定向凝固在制备非晶复合材料方面可调控析出相的优势.通过对实验参数抽拉速度的优化得出,当抽拉速度为1.0 mm/s时,最高压缩强度达到了1930 MPa,断裂塑性达到11.3%.

Plastic Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 bulk metallic glass matrix composites containing uniformly distributed dendrites in the glass matrix were synthesized by the Bridgman solidification methold. Through tailoring the withdrawal velocity, the volume fraction of dendrites with characteristic spanning length, as well as the mechanical properties of the samples can change. The characteristic spanning length of the individual dendrites roughly obeys linear relationship with the withdrawal velocity. The compressive ultimate strength and the fracture strain of the sample reached 1930 MPa and 11.3%, respectively, when the withdrawal velocity was 1.0 mm/s.