低密度NbTiAlVZr合金的微观组织和力学性能

Microstructure and Mechanical Properties of Low-Density NbTiAlVZr Alloy

摘要:

通过熔炼和压力加工研制了一种多元低密度NbTiAlVZr合金，合金密度为5.9 g/cm3，是目前难熔合金中密度最低的一种。采用光学显微镜，透射电镜，拉伸试验机对合金微观组织和力学性能进行表征，结果表明：该合金室温平均抗拉强度为990 MPa，延伸率为16%，1100 ℃抗拉强度达到80 MPa，延伸率为44%。该合金是一种综合了固溶强化和第二相TiC纳米粒子弥散强化的新型铌合金，同时也是一种塑性好，可进行压力加工成型的低密度铌合金

Abstract:

A kind of low-density niobium-based alloy NbTiAlVZr with density of 5.9 g/cm3, the lowest density for refractory alloys, was prepared by arc-melting and processing method. The microstructure and mechanical properties were characterized by optical microscopy (OM), transmission electron microscope (TEM) and tensile test. Results show that the average ultimate tensile strength (UTS) and elongation of the samples are 990 MPa, 16% at room temperature, respectively and 80 MPa, 44% at 1100 oC, respectively. This new alloy combines TiC nano-particle dispersion strengthening with solution strengthening to increase the UTS, and retains enough plasticity for hot and cold processing