中国有色金属学报（英文版）
中國有色金屬學報（英文版）
중국유색금속학보（영문판）
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
2014年
3期
632-640
,共9页
镁基复合材料%门槛应力%有效应力%本构模型
鎂基複閤材料%門檻應力%有效應力%本構模型
미기복합재료%문함응력%유효응력%본구모형
magnesium matrix composites%threshold stress%effective stress%constitutive model
利用常应力拉伸蠕变实验法对体积分数为30%的硅酸铝短纤维增强AZ91D镁基复合材料及其基体合金AZ91D在不同温度和应力下进行蠕变测试。结果表明：2种材料的真应力指数均为3，真蠕变激活能均等于144.63 kJ/mol；复合材料的蠕变是由基体的蠕变控制，以位错黏滞性滑移控制为主，晶界滑移控制为辅。由实验数据获得的蠕变本构模型的经验公式能较好地描述复合材料的蠕变变形规律。
利用常應力拉伸蠕變實驗法對體積分數為30%的硅痠鋁短纖維增彊AZ91D鎂基複閤材料及其基體閤金AZ91D在不同溫度和應力下進行蠕變測試。結果錶明：2種材料的真應力指數均為3，真蠕變激活能均等于144.63 kJ/mol；複閤材料的蠕變是由基體的蠕變控製，以位錯黏滯性滑移控製為主，晶界滑移控製為輔。由實驗數據穫得的蠕變本構模型的經驗公式能較好地描述複閤材料的蠕變變形規律。
이용상응력랍신연변실험법대체적분수위30%적규산려단섬유증강AZ91D미기복합재료급기기체합금AZ91D재불동온도화응력하진행연변측시。결과표명：2충재료적진응력지수균위3，진연변격활능균등우144.63 kJ/mol；복합재료적연변시유기체적연변공제，이위착점체성활이공제위주，정계활이공제위보。유실험수거획득적연변본구모형적경험공식능교호지묘술복합재료적연변변형규률。
By the constant stress tensile creep test method, creep tests were performed on aluminum silicate short fiber-reinforced AZ91D magnesium matrix composite with volume fraction of 30% and its matrix alloy AZ91D under different temperatures and stresses. The results indicate that the composite and the matrix have the same true stress exponent and true activation energy for creep, which are 3 and 144.63 kJ/mol, respectively. The creep of the composite is controlled by the creep of its matrix, which is mainly the controlling of viscous slip of dislocation, and the controlling of grain boundary slippage as a supplement. The creep constitutive model obtained from the experiment data can well describe the creep deformation pattern of the composite.
