采用原位反应近液相线铸造方法制备4.4%TiC_P/7075铝复合材料,在基体合金的液-固两相区间(477～635℃)的600℃分别保温10、20、40、60 min,水淬固定其半固态组织,应用Image Pro Plus软件测量平均晶粒尺寸,研究原位TiC_P对二次加热组织的影响.结果表明,原位TiC_P不仅使合金铸态组织直接转变为等轴品组织,而且在二次加热过程中,对晶粒的长大行为具有明显的抑制作用.在相同的二次加热条件下,TiC_P/7075铝复合材料的平均晶粒尺寸比7075基体合金减小了30～40 μm,更适合于半固态触变成形.
The 4. 4% TiC_P/7075 matrix composite was prepared by in- situ reactive near- liquidus casting. The sectioned specimens were heat-treated isothermally at 600℃ between the two-phase (liquid-solid) region (477 635℃) of the near-liquidus cast 7075 alloy for 10, 20, 40 and 60 min, then quenched in water. The grain size was measured using the software Image Pro Plus and the effect of in-situ TiC_P on the reheating structure was analyzed. The result shows that the in- situ TiC_P with fine and globular can not only keep near- liquidus cast 7075 alloy microstructure, but also control evidently grains growth by pinning effect during reheating. Dealing under the same condition, the grain sizes of TiC_P/7075 matrix composites are 30～40 μm less than those of 7075 alloy, which is very suitable for thixoforming.
参考文献
| [1] | Kenneth P Y.Recent advance eosin semi solid metal (SSM) cast aluminum and magnesium components[C]// 4th International Conference on Semi-solid Processing of Alloys and Composites.Sheffield,England:The University of Sheffield Press,1996:229-233. |
| [2] | 路贵民,董杰,谷晓峰,等.7075铝合金液相线铸造过程中的形核[J].东北大学学报:自然科学版,2002,23(1):38-40.Lu Guimin,Dong Jie,Gu Xiaofeng,et al.Nucleation and structures of 7075 aluminum alloy hold near liquidus[J].Journal of Northeastern University:Natural Science,2002,23(1):38-40, |
| [3] | 王平,崔建忠.近液相线法铸造非枝晶A356合金组织与成形性能[J].金属学报,2002,38(9):952-955.Wang Ping,Cui Jianzhong.Non-dendrites microstructure of A356 alloy obtained by the nearby liquidus casting and thixoformed properties[J].Acts Metallurgical Sinica,2002,38(9),952-955. |
| [4] | 刘金水,舒震,肖汉宁,等.原位TiC粒子增强ZA43复合材料的制备及组织性能[J].复合材料学报,1999,16(3):67-69.Liu Jinshui,Shu Zhen,Xiao Hanning,et al.Preparation and microstructure and mechanical properties of in situ formed tic particulate reinforced ZA43 composites[J].Acta Materiae Composite Sinica,1999,16(3):67-69. |
| [5] | Molenaar J M M,Selesmans F W H C,Katgerman L.Analysis of process limits for continuous thixopic slurry casting[J].Journal of Materials Science,1985,20(2):700-709. |
| [6] | 刘慧敏,任云,刘军,姚青虎.原位反应液相线铸造半固态铝合金的晶粒长大行为[J].材料工程,2006(1):277-279.Liu Huimin,Ren Yun,Liu Jun,Yao Qinghu.Grain growth of in-situ reactive liquidus cast Al alloy at semi-solid state[J].Journal of Materials Science and Engineering,2006(1),277-279. |
| [7] | 武恭,姚良均,李震霞,等.铝及铝合金材料手册[M].北京:科学出版社,1997:255-256.Wu Gong,Yao Liangjun,Li Zhenxia,et al.Handbook of Aluminum and Aluminum Alloys[M].Beijing:Science Press,1997:255-256. |
| [8] | Xia K,Tausing G.Liquidus casting of a wrought aluminum alloy 2618 for thixoforming[J].Materials Science and Engineering Ad,1998,246(1/2):1-9. |
| [9] | Gebelin J C,Suery M,Favier D.Characterization of the theological behavior in the semi-solid state of grain-refined AZ91 magnesium alloys[J].Materials Science and Engineering A,1999,272(1):134-139. |
| [10] | Lawrynowicz D E,Wolfenstine J,Laveruia E J.Grain growth mechanisms in a spray-formed Ni_3Al/Al_2O_3 composite in the presence of a liquid phase[J].Materials Science and Engineering A,1997,230(1/2):1-7. |
| [11] | Mao W M,Cui C L,Zhao A.Metal dynamical coarsening processes of microstructures in non-dendritic AlSi_7 Mg alloy remelted in semi-solid state[J].Trans Nonferrous Met Soc China,2000,10(1):25-28. |
| [12] | Flemings M C.Behavior of metal alloys in the semisolid state[J].Metallurgical Transaction A,1991,22(1):957-981. |
| [13] | Kim W T,Zhang D L,Cantor]3.Nucleation of solidification in liquid droplet[J].Metall Trans A,1991,22(10):2487-2501. |
| [14] | 谢水生,黄声宏.半固态金属加工技术及应用[M].北京:冶金工业出版社,1999:13-16.Xie Shuisheng,Huang Shenghong.Technology and application of semi-solid forming[M].Beijing:Metallurgy Industry Press,1999:13-16. |
| [15] | 刘慧敏,王洪斌,杨滨,等.原位TiC颗粒对喷射成形铝合金组织的影响[J].北京科技大学学报,2003,25(4):338-339.Liu Huimin,Wang Hongbin,Yang Bin,et al.Effect of insitu TiC particles on microstructure of spray-deposited 7075 alloy[J].Journal of University of Science and Technology Beijing,2003,25(4):338-339. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%