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OALib Journal期刊
ISSN: 2333-9721
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一种具有球形孔隙的高孔率泡沫钛合金*
Keywords: 金属材料,多孔金属,泡沫金属,泡沫钛合金,性能
Abstract:
？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1500-3000hz的声频范围内吸声系数最低为0.4左右，在3000-6300hz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。
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