| 王哲磊,王耀奇,侯红亮,任学平.气体捕捉法制备泡沫Ti-6Al-4V三明治结构与性能评价[J].材料导报,2016,30(10):91-94 |
| 气体捕捉法制备泡沫Ti-6Al-4V三明治结构与性能评价 |
| Preparation and Property Evaluation of Ti-6Al-4V Foams Sandwich Structure Using Gas Entrapment |
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| DOI：10.11896/j.issn.1005-023X.2016.10.021 |
| 中文关键词: 泡沫Ti-6Al-4V 气体捕捉法 三明治结构 孔洞结构 |
| 英文关键词: Ti-6Al-4V foam, gas entrapment, sandwich structure, pore morphology |
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| 中文摘要: |
| 基于气体捕捉法制备泡沫钛三明治结构工艺,对以钢包套+Ti-6Al-4V板+Ti-6Al-4V粉的封装工艺制备的泡沫Ti-6Al-4V三明治结构预制坯进行了900 ℃下不同变形量的轧制,并进行了950 ℃/10 h的等温发泡。通过SEM对不同状态的三明治结构芯部孔洞状态进行观察和测量,探究了轧制变形量对泡沫Ti-6Al-4V三明治结构预制坯等温发泡行为的影响。结果表明:轧制主要是以沿轧制方向拉长孔洞和增加孔洞连通的方式影响泡沫Ti-6Al-4V三明治结构芯部,且轧制变形量越大越严重,但对孔洞内壁形态及孔洞在垂直于轧向平面内的形态未产生影响。当预制坯轧制变形量为80%时,经等温发泡成功制备了面板厚度为362 μm,芯部孔隙率达到40%的泡沫Ti-6Al-4V三明治结构,其在高应变速率下抗压强度达到824.8 MPa,400 ℃下热导率仅为致密金属的52.8%。 |
| 英文摘要: |
| Inspired by the gas entrapment process to produce titanium foams sandwich structure, the billets fabricated from steel container filled with Ti-6Al-4V sheets and Ti-6Al-4V powders were rolled to different reductions at 900 ℃ and then isothermally foamed at 950 ℃ for 10 h to prepare Ti-6Al-4V foams sandwich structure. Pore morphologies of the sandwich core in the rolled Ti-6Al-4V foams were observed and measured by SEM, and the effect of rolling reduction on the billet′s isothermal foaming behavior was studied. Experiments inferred that rolling can elongate the pore and promote pore interconnectivity along the rolling direction which will resultantly affect the core of Ti-6Al-4V foams sandwich structure (and more seriously with higher rolling reduction), but the inner-wall morphology of pores and the pore shape in the plane perpendicular to the rolling direction are nearly uninfluenced. Using the billet with 80% rolling reduction, through 950 ℃/10 h isothermal foaming, Ti-6Al-4V foams sandwich structure with a core porosity of 40% and plate thickness reaching 362 μm was successfully produced, whose compressive strength was 824.8 MPa at high strain rate and thermal conductivity was only 52.8% of the corresponding dense metal at 400 ℃. |
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