激光选区熔化Ti-6Al-4V合金纳米压痕尺寸效应分析  

Size Effect Analysis in Nano-indentation of Ti-6Al-4V Alloy Prepared by Selective Laser Melting

作　　者：田宪会 杨诗婷[1] 董广辉 姜爱峰[1] 郎风超[1] 李继军[1] TIAN Xianhui;YANG Shiting;DONG Guanghui;JIANG Aifeng;LANG Fengchao;LI Jijun(Institute of Science,Inner Mongolia University of Technology,Huhhot 010051,China)

机构地区：[1]内蒙古工业大学理学院,呼和浩特010051

出　　处：《有色金属工程》2021年第4期19-25,共7页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(12002174,11762013,11562016);内蒙古自然科学基金(2018MS01013,2020MS01021);内蒙古工业大学科学研究项目(ZZ201812,ZY201818)。

摘　　要：在微纳观尺度下分析纳米压痕的尺寸效应,可以为研究激光选区熔化合金材料的力学性能提供较为客观的试验依据。使用准静态法对激光选区熔化制备的原始态和退火态Ti-6Al-4V合金进行了纳米压痕试验,并根据Meyer模型和比例试样阻力模型对Ti-6Al-4V合金的载荷和接触深度进行了函数拟合。结果表明:最大载荷分别为200、300、400mN时,原始态合金的硬度分别为3.64、3.71、3.94GPa,退火态合金的硬度分别为7.48、7.43、6.84GPa;拟合结果表明原始态合金呈逆压痕尺寸效应(RISE),退火态合金呈正压痕尺寸效应(ISE);比例试样阻力模型在退火态可以很好地预测合金的硬度;晶界是否连续是原始态和退火态合金产生两种不同类型压痕尺寸效应的主要原因。Under the micro-nano scale,research on the size effect of indentation may provide an objective experimental basis for exploring the mechanical properties of selective melting alloy materials.The quasi-static method was introduced to perform nano-indentation test on Ti-6Al-4Valloy in the primitive and the annealed state by selective melting technology.According to the Meyer model and the proportional sample resistance model,the load and contact depth of the Ti-6Al-4Valloy are function-fitted,and the results show that when the maximum load is 200,300,and 400mN,the hardness of the original alloy is 3.64,3.71,3.94GPa,and the hardness of the annealed alloy is 7.48,7.43,6.84GPa,respectively;the annealed titanium alloy exhibits a postive indentation size effect,whereas the primitive titanium alloy exhibits a reverse indentation size effect.The proportional sample resistance model can accurately describe the hardness of titanium alloy in the annealed state;Whether the grain boundary is continuous is the main reason for the primitive and annealed alloys to produce two different types of indentation size effects.

关 键 词：激光选区熔化 TI-6AL-4V 纳米压痕 尺寸效应 

分 类 号：TG146.23[一般工业技术—材料科学与工程]