铌添加对钛基大块金属玻璃的非晶形成能力、热稳定性及机械特性的影响(英文)  

Effects of Nb Addition on Glass-Forming Ability,Thermal Stability and Mechanical Properties of Ti-Based Bulk Metallic Glasses

作　　者：李立新[1] 刘日平[2] 赵军良[1] 蔡红新[1] 杨中娟[1] 

机构地区：[1]河南理工大学,河南焦作454000 [2]燕山大学亚稳材料科学与技术国家重点实验室,河北秦皇岛066004

出　　处：《稀有金属材料与工程》2014年第8期1835-1838,共4页Rare Metal Materials and Engineering

基　　金：National Key Basic Research Development Planning("973" Project)(2010CB731604)

摘　　要：(Ti40Zr25Cu9Ni8Be18)100-xNbx(x=0,1,3,4,5 at%)钛基大块金属玻璃由铜模铸制得,制得的金属玻璃由直径大于6 mm的全非晶相构成。铌添加对非晶形成能力和热稳定性的影响由X射线衍射仪,透射电子显微镜和示差扫描热量计分析研究,机械特性由MTS810型力学特性测试仪在室温下以压缩模式测量,应变速率为2×10-4 s-1。实验发现:铌的添加对非晶形成能力几乎没有影响,但使得热稳定性有所提高。随着铌含量的增加,合金表现出很高的抗断强度,当x=4时,合金表现出最高的耐压强度1945 MPa和塑性延伸7%,塑性有明显提高。扫描电子显微镜分析表明,(Ti40Zr25Cu9Ni8Be18)96Nb4的高延展性是由于形成了高密度的剪切带的原因。Ti-based bulk metallic glasses （BMGs） alloy of （Ti40Zr25Cu9Ni8Be18）100-xNbx with x=O, 1, 3, 4 and 5 at% were prepared by copper mould casting. Cylindrical rods of more than 6 mm in diameter consisting of fully glassy single phase were obtained. The effects of Nb addition on the glass-forming ability （GFA） and thermal stability of the （Ti40Zr25Cu9Ni8Be18）100-xNbx alloy were studied by X-ray diffraction （XRD）, transmission electron microscope （TEM） and differential scanning calorimeter （DSC）. Mechanical properties were measured on a MTS810-type machine at room temperature under a compressive mode with a strain rate of 2 × 10-4 s1. It is found that the GFA is not influenced and the thermal stability is increased by Nb addition. With the increase of Nb content, the alloys exhibit high fracture strength. When Nb content x=4, the （Ti40Zr25Cu9Ni8Be18）96Nb4 rod of fully glassy single phase exhibits the highest compressive strength of 1945 MPa and plastic elongation of about 7.0%, showing significant plasticity improvemem. The large ductility of （Ti40Zr25Cu9Ni8Be18）96Nb4 is due to the development of the large density shear bands proved by scanning electron micrographs （SEM）.

关 键 词：钛基大块金属玻璃 机械特性 热稳定性 非晶形成能力 Nb 

分 类 号：TG139.8[一般工业技术—材料科学与工程]