采用Gleeble-1500D热模拟试验机对原位合成TiB2(质量分数,8%)/6351复合材料在不同变形温度和不同应变速率条件下的热变形特性进行了研究,利用透射电镜(TEM)和光学显微镜分析了压缩后试样的微观组织.结果表明, 材料的流变应力随变形温度的升高而降低,随应变速率的提高而增大;材料的流变行为主要表现为加工硬化、动态回复和动态再结晶;相应的显微组织特征为:位错网络、混乱的位错团和胞状结构,亚晶及等轴晶.在应变速率和变形温度均较低时,增强体颗粒周围的基体中形成高密度位错区,但随变形温度的升高而减少;在应变速率较高时,增强体颗粒和基体的界面处开裂甚至增强体颗粒本身发生破碎.
参考文献
| [1] | LLOYD D J .Particle reinforced aluminum magnesium composites[J].International Materials Reviews,1994,39(01):1-22. |
| [2] | TONG G Q;CHAN K C .Deformation behavior of a PM Al6013/15SiCP composite sheet at elevated temperature[J].Materials Letters,1999,38:326-330. |
| [3] | GANESAN G;RAGHUKAN K;KARTHIKEYAN .Development of processing map for 6061 Al/15% SiCp through neural networks[J].Journal of Materials Processing Technology,2005,166:423-429. |
| [4] | S. Ramanathan;R. Karthikeyan;G. Ganasen .Development of processing maps for 2124Al/SiC_p composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):321-325. |
| [5] | P. Cavaliere;E. Cerri;P. Leo .Hot deformation and processing maps of a particulate reinforced 2618/Al_2O_3/20p metal matrix composite[J].Composites science and technology,2004(9):1287-1291. |
| [6] | Cavaliere P;Cerri E;Evangelista E .Isothermal forging of AA2618+20% Al2O3 by means of hot torsion and hot compression tests[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(0):857-861. |
| [7] | M. Vedani;F. D'Errico;E. Gariboldi .Mechanical and fracture behaviour of aluminium-based discontinuously reinforced composites at hot working temperatures[J].Composites science and technology,2006(2):343-349. |
| [8] | S. V. S. Narayana Murty;B. Nageswara Rao;B. P. Kashyap .On the hot working characteristics of 6061 Al-SiC and 6061-Al_2O_3 particulate reinforced metal matrix composites[J].Composites science and technology,2003(1):119-135. |
| [9] | 白亮,陈东,马乃恒,王浩伟.原位生成TiB2/6351复合材料的组织和性能[J].热加工工艺,2007(12):30-33. |
| [10] | 林高用,张辉,郭武超,彭大暑.7075铝合金热压缩变形流变应力[J].中国有色金属学报,2001(03):412-415. |
| [11] | MCQUEEN H J;YUE S;RYAN N D et al.Hot wor-king characteristics of steels in austenitic state[J].Journal of Materials Processing Technology,1995,53(1-2):293-310. |
| [12] | MCQUEEN H J;FRY E;BELLING J .Comparative constitutive constants for hot working of Al-414Mg-0.7Mn(AA5083)[J].Journal of Materials Engineer-ing and Performance,2001,10(02):164-172. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%