Al含量对Zr基块体非晶合金力学性能的影响

稀有金属, 2015, 39(4): 300-307. doi: 10.13373/j.cnki.cjrm.2015.04.002

Al含量对Zr基块体非晶合金力学性能的影响

李春燕 ^1, , 寇生中 ^2, , 赵燕春 ^3, , 袁小鹏 ^4, , 袁子洲 ^5,

1.兰州理工大学材料科学与工程学院甘肃兰州730050;兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

2.兰州理工大学材料科学与工程学院甘肃兰州730050;兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

3.兰州理工大学材料科学与工程学院甘肃兰州730050;兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

4.兰州理工大学材料科学与工程学院甘肃兰州730050

5.兰州理工大学材料科学与工程学院甘肃兰州730050;兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

基金项目: 国家自然科学基金项目(50961008,51061008) 甘肃省有色金属新材料省部共建国家重点实验室开放基金项目(SKL12008)资助甘肃省青年科技基金计划项目(1107RJYA275) 国家科技部重点基础研究发展计划项目(2011CB612203) 甘肃省科技计划项目(145RJZA090)

关键词： Zr基块体非晶合金 , 力学性能 , 塑性应变 , 加工硬化 , 显微硬度

Mechanical Properties of Zr-Based Bulk Metallic Glasses with Different Ai Contents

Keywords： Zr-based bulk metallic glasses , mechanical properties , plastic strain , work-hardening , microhardness

用铜模吸铸法制备了(Zr64.8/90 Cu 14.85/90Ni10.35/90)90+xAl10-x(x=-4,-3,-2,0,2,4,6)块体合金,利用X射线衍射仪(XRD)、万能试验机、显微硬度计和扫描电镜(SEM)研究了Al含量对Zr基块体非晶合金力学性能的影响.结果表明:随着AL含量的减小,合金先是从非晶相为主的非晶/晶体复合材料转变为完全非晶材料,接着转变为以晶体相为主的非晶/晶体复合材料,最后转变为完全晶体材料.表明通过调整Al的含量,可以制备出具有完全非晶结构的Zr基块体非晶合金.当x=-2时,即合金成分为Zr63.36 Cu14.52 Ni10.12 Al12时,合金为完全非晶结构,该合金的室温压缩塑性应变达到20.6％,应力-应变曲线体现出了“加工硬化”特性,屈服强度οs、极限强度οm和断裂强度οf分别为1740.6,2030.7和1510.5 MPa.表明通过调整Al的含量,可以制备出具有优良室温压缩塑性的Zr基块体非晶合金.随着Al含量的减小,合金试样的显微硬度的总体趋势为先增大再减小.当x=2时,合金为非晶/晶体复合材料,该合金具有较高的显微硬度HV719.8.

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