采用Gleeble-1500热模拟机对Mg-Gd-Y-Mn稀土镁合金在温度为300~500℃、应变速率为0.001~1.0s-1、最大变形程度为60%的条件下,进行恒应变速率高温压缩模拟实验研究.分析了实验合金高温变形时流变应力与应变速率及变形温度之间的关系以及组织变化,计算了表观激活能及相应的应力指数,为选择这种合金的热变形加工条件提供了实验依据.结果表明:合金的稳态流变应力随应变速率的增大而增大,在恒应变速率条件下,合金的真应力水平随温度的升高而降低;在给定的变形条件下,计算得出的表观激活能和应力指数分别为200kJ·mol-1和5.1.根据实验分析,合金的热加工宜在400~500℃温度范围内进行.
参考文献
[1] | Ifeanyi Anthony Anyanwu;Shigeharu Kamado;Yo Kojima .Creep Properties of Mg-Gd-Y-Zr Alloys[J].Materials transactions,2001(7):1212-1218. |
[2] | Luo Alan A .Recent magnesium alloy development for automotive powertrain application[J].Materials Science Forum,2003,419-422(01):56-57. |
[3] | Drits M E;Sviderkaya Z A;Rokhlin L L et al.Effect of alloying on properties of Mg-Gd alloys[J].Metallovedenie i Termicheskaya Obrabotka Metallov,1979,11:62-64. |
[4] | Shigeru I;Yuuji N;Shigeharu K et al.Age hardening characteristics and high temperature tensile properties of Mg-Gd and Mg-Dy alloys[J].Journal of Japan Institute of Light Metals,1994,44(01):3-8. |
[5] | Rokhlin LL.;Nikitina NI. .Recovery after ageing of Mg-Y and Mg-Gd alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(2):166-170. |
[6] | Negishi Y;Nishimura T et al.Phace diagrams of magnesium-rice portion,aging characteristics and tensile properties of Mg heavy rare earth metal(Gd,Dy)-Nd alloys[J].Keikinzoku/Journal of Japan Institute of Light Metals,1995,45(02):57-63. |
[7] | Taniike S;kitaquchi Y et al.Forgeability of Mg-heavy rare earth metal alloys and aging characteristics and tensile properties of their forged material[J].Keikinzoku/Journal of Japan Institute of Light Metals,1997,47(05):261-266. |
[8] | Anyanwu I A;Kitaguchi Y;Harima Y.[A].Dead Sea,1997:123-132. |
[9] | Kiryuu M;Okumura H;Kamado S et al.Corrosion resistence of heat resistant magnesium alloys containing heavy rare earth elements[J].Keikinzoku/Journal of Japan Institute of Light Metals,1996,48(04):174-178. |
[10] | 夏长清,武文花,吴安如,王银娜.Mg-Nd-Zn-Zr稀土镁合金的热变形行为[J].中国有色金属学报,2004(11):1810-1816. |
[11] | Poirier J P;关德林.晶体的高温塑性变形[M].大连:大连理工大学出版社,1989:25-30. |
[12] | Crossland I G;Jones R B .Dislocation creep in magnesium[J].Metal Science Journal,1972,6:162. |
[13] | Escaig B.Contribution à l'étude des déviation dans la structures cubique à faces centrées,cubique centre et hexagonale compacte[M].Thése Paris-orsay,1968 |
[14] | Mehrer H;Seeger A .Interpretation of self diffusion and vacancy properties in silver[J].Physica Status Solidi,1970,39:647. |
[15] | Edlin G;Poirier J P .Etude de la montée des dislocations au moyen d'expériences de fluage par montée dans le magnesium[J].Philosophical Magazine,1973,28:1203-1211. |
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%