Zr-Al-Cu-Ni-Ag非晶复合材料的显微硬度和剪切带形貌*

doi:10.11901/1005.3093.2014.153

材料研究学报

2014, Vol. 28

Issue (10): 730-736 DOI: 10.11901/1005.3093.2014.153

本期目录 | 过刊浏览

Zr-Al-Cu-Ni-Ag非晶复合材料的显微硬度和剪切带形貌*

李亭亭,胡勇,崔晓明,闫志杰(

)

太原科技大学材料科学与工程学院太原 030024

Micro-hardness and Shear Bands of Zr-Al-Cu-Ni-Ag Bulk Metallic Glass Composites

Tingting LI,Yong HU,Xiaoming CUI,Zhijie YAN(

)

School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024

引用本文:

李亭亭,胡勇,崔晓明,闫志杰. Zr-Al-Cu-Ni-Ag非晶复合材料的显微硬度和剪切带形貌*[J]. 材料研究学报, 2014, 28(10): 730-736.
Tingting LI, Yong HU, Xiaoming CUI, Zhijie YAN. Micro-hardness and Shear Bands of Zr-Al-Cu-Ni-Ag Bulk Metallic Glass Composites[J]. Chinese Journal of Materials Research, 2014, 28(10): 730-736.

全文: PDF(4167 KB) HTML

摘要:

使用差氏扫描量热仪、维氏显微硬度计和扫描电子显微镜研究了过冷液相区内不同温度等温退火处理对Zr-Al-Cu-Ni-Ag块体非晶合金的显微硬度和剪切带形核、扩展的影响。结果表明, 等温退火处理后非晶合金的初晶相为二十面体准晶相(I-相), 其体积分数随着退火温度的升高呈现上升的趋势; 复合材料的显微硬度随着晶化体积分数的升高呈现增大的趋势; 界面压痕下方剪切带密度随着晶化体积分数的升高则呈现下降的趋势。这是等温退火导致非晶合金发生结构弛豫和第二相析出综合作用的结果。

关键词 ：金属材料, 力学行为, 晶化体积分数, 显微硬度, 剪切带

Abstract：

Zr-Al-Cu-Ni-Ag bulk metallic glass (BMG) composites, which consisted of an amorphous matrix and embedded nanocrystallites, were prepared by isothermal annealing the Zr-Al-Cu-Ni-Ag in supercooled liquid regions. The micro-hardness of the composites was measured by Vickers indenter and the morphologies of shear bands formed due to indentation were investigated by scanning electron microscopy. The results indicate that the primary phase during annealing is icosahedral phase (I-phase) and the crystallization volume fraction monotonically increases with the increasing of annealing temperature. The micro-hardness increases with the increasing of crystallization volume fraction, while the density of shear band decreases, which are the results of structure relaxation and the precipitation of nanocrystallites.

Key words： metallic materials mechanical behaviors crystallization volume fraction micro-hardness shear bands

收稿日期: 2014-04-01

基金资助:* 国家自然科学基金51204118;山西省自然科学基金2011021020-1和2012021018-3;山西省高等学校青年学术带头人支持计划项目(2013);太原科技大学研究生科技创新项目20134009资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.153 或 https://www.cjmr.org/CN/Y2014/V28/I10/730

图1 块体非晶合金Zr65Al7.5Cu12.5Ni10Ag5在不同状态下的XRD图谱

图2 铸态Zr65Al7.5Cu12.5Ni10Ag5试样的TEM和HRTEM像

图3 不同温度等温退火处理试样的DSC曲线及其局部放大图

表1 不同状态下非晶合金的特征温度、热焓和剪切带间距值

图4 块体非晶合金Zr65Al7.5Cu12.5Ni10Ag5在不同状态下的显微硬度值

图5 铸态及Vf=44.05%试样的剪切带全貌及局部放大照片

图6 不同状态非晶合金界面压痕下方剪切带的局部放大图像

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