研究了挤压态AZ91镁合金的SIMA法半固态组织演变.结果表明:挤压合金为以α-Mg再结晶等轴晶为主相,与极少量细粒状成串分布于α-Mg基体上的Mg17Al12颗粒组成的两相组织,基体中存在大量的大角度亚晶及高密度的位错缠结.在二次加热过程中,原子扩散通道多,晶界液化及颗粒球化所需的加热温度低,等温时间短.565℃等温5min,即可获得固相率为57%,颗粒平均直径为58 μm、形状圆整、分布均匀的半固态组织.等温5 min后,半固态颗粒发生长大,其长大机制为Ostwald熟化.
参考文献
| [1] | Aghion E.;Bronfin B. .Magnesium Alloys Development towards the 21~(st) Century[J].Materials Science Forum,2000(0):19-28. |
| [2] | Kirkwood D H .Semisolid metal forming[J].International Materials Reviews,1994,39(05):173-189. |
| [3] | Dworog A;Kothen M;Hartmann.Semisolid injection of magnesium alloys[A].Munich,2000:577-583. |
| [4] | 吉泽升,李庆芬,刘兆晶,郑小平,路维.应变诱发AZ91D镁合金半固态组织形态及形成机理[J].中国有色金属学报,2003(05):1156-1160. |
| [5] | Kamado S;Ikerya N;Rudi R S et al.Application of semi-solid forming to Mg-Al-Zn-Ca alloys[J].Materials Science Forum,2000,350-351:205-214. |
| [6] | Tzimas E.;Zavaliangos A. .Mechanical behavior of alloys with equiaxed microstructure in the semisolid state at high solid content[J].Acta materialia,1999(2):517-528. |
| [7] | 孙建林,康永林,肖邦国,安林.镁合金半固态材料成形与浆料制备工艺研究[J].稀有金属,2004(01):104-107. |
| [8] | 姜巨福,罗守靖,王迎.等径道角挤压AZ91D镁合金的半固态组织演变[J].中国有色金属学报,2004(05):752-758. |
| [9] | Lapkowski W .Some studies regarding thixoforming of metal alloys[J].Journal of Materials Processing Technology,2001,111:463-468. |
| [10] | Evangelos Tzimas;Antonios Zavaliangos .Evolution of near-equiaxed microstructure in the semisolid state[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):228-240. |
| [11] | 甄子胜,毛卫民,闫时建,崔成林,赵爱民,钟雪友.连续冷却条件下半固态AZ91D镁合金组织及流变特性[J].金属学报,2003(01):71-74. |
| [12] | 李元东,郝远,陈体军,阎峰云.等温热处理工艺对AZ91D镁合金半固态组织演变和成形性的影响[J].中国有色金属学报,2002(06):1143-1148. |
| [13] | Shigehuaru K;Akira Y;Takahisa H et al.Effect of stirring conditions on structure and apparent viscosity of semi-solid AZ91D magnesium alloy[J].Japanese Journal of Institute of Light Metals(Japan),1992,42(12):734-740. |
| [14] | 李元东,郝远,闫峰云,方铭.AZ91D镁合金在半固态等温热处理中的组织演变[J].中国有色金属学报,2001(04):571-575. |
| [15] | KITAYAMA M;Hirao K;Toriyama M et al.Modeling and simulation of grain growth in Si3N4(Ⅰ) : anisotropic Ostwald ripening[J].Acta Materialia,1998,46(18):6541-6550. |
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%