一种具有球形孔隙的高孔率泡沫钛合金<sup>*</sup>

doi:10.11901/1005.3093.2014.413

材料研究学报

2015, Vol. 29

Issue (5): 346-352 DOI: 10.11901/1005.3093.2014.413

本期目录 | 过刊浏览

一种具有球形孔隙的高孔率泡沫钛合金^*

刘培生(

),顷淮斌

射线束技术与材料改性教育部重点实验室北京师范大学核科学与技术学院北京 100875

A Spherical-pore Foamed Titanium Alloy with High Porosity

Peisheng LIU(

),Huaibin QING

(Key Laboratory of Beam Technology and Material Modification of Ministry of Education,
College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China)

引用本文:

刘培生,顷淮斌. 一种具有球形孔隙的高孔率泡沫钛合金^*[J]. 材料研究学报, 2015, 29(5): 346-352.
Peisheng LIU, Huaibin QING. A Spherical-pore Foamed Titanium Alloy with High Porosity[J]. Chinese Journal of Materials Research, 2015, 29(5): 346-352.

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摘要:

通过对粉体熔化发泡法的改进, 制备了孔率高达90%的毫米级球孔泡沫钛合金。这种泡沫钛合金的压缩曲线包括弹性区、压缩平台区和“密实化”区等3个阶段。由于是脆性破坏, 其中的压缩平台呈锯齿状。这种泡沫钛合金的压缩破坏是通过垂直于载荷方向的孔隙逐层坍塌破碎而不断推进的, “密实化”是碎块的不断堆积过程。孔壁上的微孔对该泡沫钛的吸声性能有利, 未作任何处理的试样在1500-3000 Hz的声频范围内吸声系数最低为0.4左右, 在3000-6300 Hz则吸声系数超过0.6, 共振频率超过0.9。在较高声频段, 这种泡沫钛试样的主要吸声机制为黏滞耗散。

关键词 ：金属材料, 多孔金属, 泡沫金属, 泡沫钛合金, 性能

Abstract：

A millimeter-scale spherical-pore foamed titanium alloy with very high porosity up to 90% has been produced by an improved molten powder foaming method. The compression curve of this foamed alloy includes three phases: the elasticity, the compression plateau and the “densification”. The compression plateau presents a saw-tooth shape due to the brittle failure. During compression test this foamed alloy failed through collapse of pores layer by layer along the compressive stress direction, and the “densification” might be resulted from the accumulation of the collapse debris of pores. Tiny pores on walls of macro-pores are certainly beneficial to the sound-absorbing property for the present foamed titanium alloy, of which the sound-absorbing coefficient is at least about 0.4 in the frequency range of 1500-3000 Hz, and exceeds 0.6 in the range of 3000-6300 Hz and 0.9 by the resonance frequency. In addition, the mechanism related to the sound absorbing in the range of relatively high frequencies may mainly involve the viscous dissipation process.

Key words： metallic materials porous metal foamed metal foamed titanium alloy properties

收稿日期: 2014-08-11

基金资助:^*北京市凝聚态物理重点学科共建项目XK100270454和北师大测试基金C14支持项目。

作者简介: 刘培生，教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.413 或 https://www.cjmr.org/CN/Y2015/V29/I5/346

表1 泡沫钛合金试样的孔隙参数

图1 孔径较大和孔径较小的泡沫钛合金圆形样品的宏观形貌及孔壁的微观结构

图2 泡沫钛合金制品的XRD谱

图3 孔率约90%的试样压缩到名义应变为1/3左右时的破坏状态: 高度方向为压缩方向

图4 胞孔泡沫钛合金的压缩曲线: 孔率约90%的试样终止于应变到1/3左右的不完全曲线

图5 孔率约89%的试样压缩到名义应变为2/3左右时的破坏状态

图6 胞孔泡沫钛合金的压缩曲线: 孔率约89%的试样终止于应变到2/3左右的较完全曲线

图7 泡沫钛合金试样压缩破坏后断口处的孔隙形貌和断裂位置的孔壁断口形貌

图8 样品的吸声系数与频率的关系

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