In Situ Determination of Micro-properties of Tungsten Alloy Matrix
-
摘要: 为研究钨合金材料基体相的细观本构关系,采用纳米压痕实验,测定了钨合金基体相微观硬度和平均弹性模量.由纳米压痕实验得到的载荷-位移关系,利用材料的弹塑性硬化模型,经有限元计算,得到了基体相细观屈服强度、硬化模量、弹塑性性能参数和应力-应变关系曲线.分析结果表明,合金成分及变形强化是影响钨合金强度和硬度的两个基本因素.钨合金基体相微观强度和硬度随变形量或钨含量增大而增大.Abstract: To obtain the micro-properties of tungsten alloy matrix,its micro-hardness and micro-elastic modulus were measured by nano-indentation experiments.The micro-yield strength,micro-hardening modulus,elastoplastic parameters and the stress-strain relationship of the tungsten alloy matrix were determined using the finite element method,a hardening model,and the load-displacement relationship obtained from nano-indentation experiments.Analyses of the results show that the composition of the alloy and deformation strengthening are two basic factors to influence the micro-properties of tungsten alloy matrix.The micro-hardness and micro-yield strength of the alloy matrix increase with an increase in deformation or in the concentration of tungsten.
-
RANDALL N X,JULIA-SCHMUTZ C.Novel nanoindentation method for characterizing multiphase materials[J].Thin Solid Films,1997,308-309:297-303.[2] OLIVER W C,PHARR G M.An improved technique for determining hardenss and elastic mdulus using load and displacement sensing indentation experiments[J].Journal of Materrials Research,1992,7 (6):1564-1580.[3] 张泰华,杨业敏.纳米硬度技术的发展和应用[J].力学进展,2002,32(3):349-364.ZHANG Taihua,YANG Yemin,Developments and applications of nano hardness techniques[J].Advances in Mechanics,2002,32(3):349-364.[4] ELGHAZAL H,LORMAND G,HAMEL A,et al.Microplasticity characteristics obtained through nano-indentation measurements:application to surface hardened steels[J].Materials Science and Engineering,2001,A303:110-119.[5] 黄伟,赵宝荣,史洪刚,等.用纳米压痕测定钨合金材料的微观本构关系[J].兵工学报,2006,27(2):347-350.HUANG Wei,ZHAO Baorong,SHI Honggang,et al.The strain hardening law of micro-structure of WHA tested by a nanoindentation method[J].Acta Armamentarii,2006,27(2):347-350. -
点击查看大图
计量
- 文章访问数: 1309
- HTML全文浏览量: 68
- PDF下载量: 272
- 被引次数: 0
下载: