挤压开坯γ-TiAl合金的热变形行为研究
采用Gleeble-1500试验机对经过挤压比为12开坯后的γ-Ti Al合金在温度为900~1100℃、应变速率为0.01~1s-1、变形量为70%等温恒应变速率下的热变形行为进行了研究,获得了变形条件范围内的流变应力数据,并利用Ze-ner-Hollomn参数和Arrhenius方程得出γ-Ti Al合金的本构方程。结果表明：γ-Ti Al合金在900℃,应变速率为1s-1和0.1s-1的条件下新生动态再结晶晶粒较少,并且动态再结晶发生的热力学条件比一般高温合金更加苛刻。所获得的流变应力方程为σ=48.1（lnε.＋413.53×103/RT-28.37）;其热变形激活能Q=413.53k...
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| Veröffentlicht in: | 材料工程 2011 (5), p.62-65 |
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| creator | 付明杰 静永娟 张继 |
| description | 采用Gleeble-1500试验机对经过挤压比为12开坯后的γ-Ti Al合金在温度为900~1100℃、应变速率为0.01~1s-1、变形量为70%等温恒应变速率下的热变形行为进行了研究,获得了变形条件范围内的流变应力数据,并利用Ze-ner-Hollomn参数和Arrhenius方程得出γ-Ti Al合金的本构方程。结果表明：γ-Ti Al合金在900℃,应变速率为1s-1和0.1s-1的条件下新生动态再结晶晶粒较少,并且动态再结晶发生的热力学条件比一般高温合金更加苛刻。所获得的流变应力方程为σ=48.1（lnε.＋413.53×103/RT-28.37）;其热变形激活能Q=413.53kJ/mol,为科学设计和有效控制γ-Ti Al合金的锻造工艺提供了理论依据。 |
| doi_str_mv | 10.3969/j.issn.1001-4381.2011.05.014 |
| format | Article |
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| ispartof | 材料工程, 2011 (5), p.62-65 |
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| language | chi |
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| source | IngentaConnect Free/Open Access Journals; Alma/SFX Local Collection |
| subjects | γ-TiAl合金 动态再结晶 挤压开坯 流变应力 热压缩 |
| title | 挤压开坯γ-TiAl合金的热变形行为研究 |
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