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材料研究学报  2009, Vol. 23 Issue (1): 27-31    
  研究论文 本期目录 | 过刊浏览 |
泡沫铝合金异型件形成过程中的冶金结合
褚旭明; 王辉; 何德坪; 何思渊
东南大学材料科学与工程学院 南京 210096
Metallurgy bonding on the fabrication of shaped Al alloy foam
CHU Xuming; WANG Hui; HE Deping; HE Siyuan
School of Materials Science and Engineering; Southeast University; Nanjing 210096
引用本文:

褚旭明 王辉 何德坪 何思渊. 泡沫铝合金异型件形成过程中的冶金结合[J]. 材料研究学报, 2009, 23(1): 27-31.
, , . Metallurgy bonding on the fabrication of shaped Al alloy foam[J]. Chin J Mater Res, 2009, 23(1): 27-31.

全文: PDF(745 KB)  
摘要: 

采用多块均匀分布过剩TiH2的球形孔泡沫铝合金作为坯料置于异型件模具中, 用二次泡沫化方法制备出具有均匀孔结构的高孔隙率泡沫铝合金合金异型件. 用光学显微镜和层析X射线成像仪(X--CT)观察异型件的冶金结合界面结构, 并对异型件冶金结合界面的拉伸性能进行了实验研究. 结果表明, 采用二次发泡方法在发泡温度700--900℃、发泡时间250--800 s条件下, 可以实现泡沫铝合金的有效冶金结合; 形成的异型件结合界面连接机制分为界面机械连接与界面扩散连接; 泡沫铝合金异型件冶金结合面的抗拉强度随着孔隙率的升高而降低, 泡沫铝合金异型件的孔隙率为74.9\%时, 结合界面处抗拉强度与泡沫铝合金的本体强度相当.

关键词 金属材料泡沫铝合金异型件二次泡沫化界面结构抗拉强度    
Abstract

Equal high porosity shaped Al alloy foam were fabricated by metallurgy bonding of Al alloy foam flans in the shaped mould with enough equal TiH2 powder by two--step foaming (TSF) method. The microstructure of bonding joint between Al alloy foam was observed by using stereo--microscope and X--CT, and the tensile strength of the bonding joint was tested. The results show that the optimized temperature and foaming time for appropriate bonding are 700--900℃ and 250--800 s, respectively. The interface mechanical joining and the interface diffusion dominate the bonding mechanisms of Al alloy foam by TSF method. The metallurgy bonding tensile strength of shaped Al alloy foam increases with the decrease of the porosity of Al alloy foam, and the bonding strength is close to the Al alloy foam matrix when the porosity rises to 74.9%.

Key wordsmetallic materials    shaped Al alloy foam    two--step foaming    interfacial structure    tensile strength
收稿日期: 2008-07-28     
ZTFLH: 

TG146

 
基金资助:

国家重点基础研究发展计划2006CB601201和国家自然科学基金50471031资助项目.

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