摘要
采用高真空电弧熔炼喷射成形法制备Zr48-x Cu45Al7Gdx(x=0～7)大块非晶。利用X射线衍射仪、差示扫描量热仪、扫描电子显微镜、压缩试验和硬度试验分别研究Gd含量对合金非晶形成能力,组织形貌与断口形貌和力学性能的影响。结果表明,Gd含量对合金系的非晶形成能力和力学性能有显著影响,Gd含量为(2～5)at%时,可制得直径4 mm大块非晶,非晶合金具有较大过冷液相区ΔTx(73～79 K),约化玻璃转变温度Trg(0.694～0.698)。合金由无特征非晶组织构成,抗压强度σb为1768～1794 MPa,HV硬度为5.08～5.32 GPa。压缩试验中,试样以纯弹性变形方式发生脆性断裂,断口光滑平整,为典型脉络状花纹。
Zr48-xCu45A17Gdx（x=0-7） bulk metallic glasses （BMGs） were prepared by injection in copper mould with arc melting. The effect of Gd content on the glass-forming ability （GFA）, microstructures, fractured surfaces and mechanical properties of the alloys were investigated by X-ray diffraction （XRD）, differential scanning calorimetry （DSC）, scanning electron microscope （SEM）, hardness tests and compression tests. Results show that Gd content has evident effect on the GFA and mechanical properties, the rod-shaped BMGs with 4mm diameter can be obtained at Gd content of （2-5） at%. The BMGs possess a larger supercooled liquid region ATx with value of 73-79 K and a better reduced glass transition temperature Trg with value of 0.694-0.698, which consists of only amorphous phases with compression strength 6b of 1768--1794 MPa and Vickers hardness of 5.08-5.32 GPa. In compression test of the BMGs a brittle fracture happens in pure elastic deformation way, and all fractured surfaces are fiat and smooth with typical vein-like morphologies.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第1期140-144,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51165016)
