在不同的二次加热温度和保温时间条件下,对喷射沉积7075+1.7%(体积分数)TiC铝合金的二次加热工艺进行研究.采用扫描电镜观察合金的二次加热组织,利用平均截线法统计晶粒尺寸.结果表明,在580℃进行二次加热时其晶粒长大非常缓慢,温度提高到600℃后,晶粒长大速度有所提高.在580℃和600℃分别保温60min后,合金对应的平均晶粒尺寸为14μm 和20μm.二次加热温度超过610℃后晶粒长大速度显著提高,并出现明显的局部重熔现象.对应620℃保温30min的平均晶粒尺寸53μm.说明在上述条件下得到的半固态坯料仍保持细小等轴晶组织的特征,能够满足后续的触变成形工艺对合金组织的要求.
参考文献
| [1] | 康智涛,张豪,陈振华.6066/SiC喷射共沉复合材料的半固态加工[J].中国有色金属学报,1998(04):595-599. |
| [2] | Yu. Fuxiao;Cui Jianzhong;S. Ranganathan;E. S. Dwarakadasa .Fundamental differences between spray forming and other semisolid processes[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(0):621-626. |
| [3] | Jung H.K.;Kang C.G. .Reheating process of cast and wrought aluminum alloys for thixoforging and their globularization mechanism[J].Journal of Materials Processing Technology,2000(3):244-253. |
| [4] | ANNAVARAPU S;DOHERTY R D .Inhibited coarsening of solid-liquid microstructures in spray coasting at high volume fractions of solid[J].Acta Metallurgica Et Materialia,1995,43(08):3207-3212. |
| [5] | LAWRYNOWICZ D E;WOLFENSTINE J;LAVERNIA E J .Grain growth mechanisms in a spray-formed Ni3Al/Al2O3 composite in the presence of a liquid phase[J].Materials Science and Engineering,1997,A230:1-10. |
| [6] | J. L. Wang;Y. H. Su;C. -Y. A. Tsao .STRUCTURAL EVOLUTION OF CONVENTIONAL CAST DENDRITIC AND SPRAY-CAST NON-DENDRITIC STRUCTURES DURING ISOTHERMAL HOLDING IN THE SEMI-SOLID STATE[J].Scripta materialia,1997(12):2003-2007. |
| [7] | MANSON-WHITTON E D;STONE I C;JONES J R et al.Isothermal grain coarsening of spray formed alloy in the semi-solid state[J].Acta Materialia,2002,50:2517-2535. |
| [8] | 杨滨,王锋,黄赞军,段先进,张济山.喷射沉积成形颗粒增强金属基复合材料制备技术的发展[J].材料导报,2001(03):4-6. |
| [9] | 武恭;姚良均;李震霞.铝及铝合金材料手册[M].北京:科学出版社,1997:255-256. |
| [10] | LAWRYNOWICZ D E;WOLFENSTINE J;LAVERNIA E J .Grain growth mechanisms in a spray-formed NiAl/Al2O3 composite in the presence of a liquid phase[J].Materials Science and Engineering,1997,A 230:1-13. |
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%