采用Gleeble-1500D热模拟试验机,对30%SiCp/2024A1复合材料在温度为350~500℃、应变速率为0.01~10 s-1条件下进行热压缩试验,研究该复合材料的热变形行为与热加工特征,建立热变形本构方程和加工图.结果表明,30%SiCp/2024A1复合材料的流变应力随温度升高而降低,随应变速率增大而升高,说明该复合材料是一个正应变速率敏感的材料,其热压缩变形时的流变应力可采用Zener-Hollomon参数的双曲正弦形式来描述,在本实验条件下平均热变形激活能Q为153.251 kJ/mol.为了证实其潜在的可加工性,对加工图中的稳定区和失稳区进行标识,并通过微观组织得到验证.综合考虑热加工图和显微结构,变形温度为450℃,应变速率为1 s-1是复合材料适宜的热变形条件.
参考文献
[1] | Shao, J.C.;Xiao, B.L.;Wang, Q.Z.;Ma, Z.Y.;Liu, Y.;Yang, K. .Constitutive flow behavior and hot workability of powder metallurgy processed 20vol.%SiC_P/2024Al composite[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2010(29/30):7865-7872. |
[2] | Rezaei Ashtiani, H.R.;Parsa, M.H.;Bisadi, H..Constitutive equations for elevated temperature flow behavior of commercial purity aluminum[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2012:61-67. |
[3] | Spigarelli S.;Cerri E.;Cavaliere P.;Evangelista E. .An analysis of hot formability of the 6061+20% Al2O3 composite by means of different stability criteria[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(2):144-154. |
[4] | GUO Sheng-li,LI De-fu,CHEN Dong,WANG Hao-wei.Characterization of deformation stability of in-situ TiB_2/6351 composites during hot compression based on Murty criterion[J].中国有色金属学报(英文版),2010(02):267-275. |
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%