摘要
通过添加不同体积分数的Nb,本工作设计了一系列Zr基非晶复合材料,主要研究了Nb含量对铸态、半固态非晶复合材料的微观组织及塑性性能的影响。结果表明:非晶复合材料塑性应变量随晶体相(β-Zr相)体积分数增加而呈现S型增强规律。半固态等温处理后的非晶复合材料塑性提升,但其塑性增长率随Nb含量增加而减小。当D C(当量直径)/X(平均自由程间距)≥0.65时,β-Zr相体积分数出现最小临界阈值35%,此时材料塑性开始迅速提升;D C/X≥1.5时,β-Zr相体积分数超过54%后,材料塑性保持稳定,进一步说明非晶复合材料塑性与β-Zr相体积分数有关。
Aseries of Zr-based bulk metallic glasses matrix composites were designed by adding Nb with different volume fractions.The effect of Nb content on the microstructure and mechanical properities of as-cast and semi-solid amorphous composite materials were studied.It is demonstrated that the plastic strain of the amorphous composite material exhibits an S-type enhancement trend with the increase of the volume fraction of the crystalline phase(β-Zr phase).After the semi-solid isothermal treatment,the plasticity of the amorphous composite material increases,but its plastic growth rate decreases with the increase of Nb content.When D C(equivalentdiameter)/X(free-pathspacing)≥0.65,theβ-Zr phase volume fraction appears the minimum critical threshold of 35%,and the material plasticity begins to increase rapidly at this time;theβ-Zr phase volume fraction exceeds 54%,for D C/X≥1.5,and the plasticity of the material remains stable,which further shows that the plasticity of amorphous composites is related to the volume fraction ofβ-Zr phase.
作者
杨湘杰
杨颜
刘军
史坤
郑彬
YANG Xiangjie;YANG Yan;LIU Jun;SHI Kun;ZHENG Bin(School of Mechanical and Electrical Engineering,University of Nanchang,Nanchang 330031,China;Jiangxi Province High Performance Precision Forming Laboratory,Nanchang 330031,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第4期159-165,共7页
Materials Reports
基金
国家自然科学基金(11364031)。
关键词
块体非晶复合材料
半固态等温热处理
微观结构
剪切带
bulk metallic glass composites
semi-solid isothermal treatment
microstructure
shear band
