通过对未加Ｔｉ及加有不同量Ｔｉ的Ｆｅ－３６．５Ａｌ（原子分数，％）基合金的高温变形行为的研究，发现加Ｔｉ的合金在９００—１０００℃，初始应变速率为２．０８×１０￣（－４）－８．３３×１０￣（－２）ｓ￣（－１）范围内比未加Ｔｉ的ＦｅＡｌ合金的延伸率有较大幅度提高，且应变速率敏感性指数ｍ值普遍超过０．３。随含Ｔｉ量的增加，ｍ值及延伸率也普遍提高，最高值分别达到０．４３和２９７％．金相及ＴＥＭ分析表明，变形过程中出现了明显的晶粒细化及亚晶形成过程，并由此导致了大晶粒含钛ＦｅＡｌ基合金的超塑性。
High temperature deformation behaviours of a binary FeAl compound and FeAl based alloys added different Ti contents have been investigated. The elongations of FeAl-Ti alloys were larger than that of the binary FeAl compound under an initial strain rate range of 2.08×10~(-4)-8.33×10~(-2) s~(-1), tested at 900-1000℃. The strain rate sensitivity index, m, is over 0.3 commonly. With the increase in Ti content in FeAl alloys, m value and elongation increase significantly. The maximum m value and the maximum elongation were up to 0.43 and 297% respectively. Microstructure analyses and TEM graphs show that grains became fine and subboundaries were formed during superplastic deformation, which resulted in the superplasticity in large grained FeAl-Ti alloys. Correspondent: LIN Dongliang,(professor, Department of Materials Science, Shanghai Jiaotong University, Shanghai 200030)
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | NeihTG．In:MayoMJ,KobayashiM,WadsworthJeds．,SuperplasticityinMetals,CeramicandIntermetallics,Vol．196,Pittsburgh:MaterialsResearchSociety,1990:1892OchiaiS,KobayashiM．MichimuraK．In:MayoMJ,KobayashiM,WadsworthJeds．,SuperplasticityinMetals,CeramicandIntermetallics,Vol．196,Pittsburgh:MaterialsResearchSociety,1990:2013LinDL,ShanAD,LiDQ．ScrMetallMaler,1994 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%