二次枝晶臂间距对A319铝合金拉伸及疲劳性能的影响

doi:10.11901/1005.3093.2014.117

材料研究学报

2014, Vol. 28

Issue (8): 587-593 DOI: 10.11901/1005.3093.2014.117

本期目录 | 过刊浏览

二次枝晶臂间距对A319铝合金拉伸及疲劳性能的影响

沈月,何国球(

),田丹丹,樊康乐,刘晓山,莫德锋

同济大学材料科学与工程学院上海市金属功能材料开发应用重点实验室上海 201804

Effect of Secondary Dendrite Arm Spacing on Tensile Property and Fatigue Behavior of A319 Aluminum Alloy

Yue SHEN,Guoqiu HE(

),Dandan TIAN,Kangle FAN,Xiaoshan LIU,Defeng MO

School of Materials Science and Engineering, Tongji University, Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Shanghai 201804

引用本文:

沈月,何国球,田丹丹,樊康乐,刘晓山,莫德锋. 二次枝晶臂间距对A319铝合金拉伸及疲劳性能的影响[J]. 材料研究学报, 2014, 28(8): 587-593.
Yue SHEN, Guoqiu HE, Dandan TIAN, Kangle FAN, Xiaoshan LIU, Defeng MO. Effect of Secondary Dendrite Arm Spacing on Tensile Property and Fatigue Behavior of A319 Aluminum Alloy[J]. Chinese Journal of Materials Research, 2014, 28(8): 587-593.

全文: PDF(3310 KB) HTML

摘要:

改变到模具底部的距离制备出不同二次枝晶臂间距(SDAS)的A319铝合金, 讨论了SDAS与孔洞尺寸、硅颗粒尺寸及形态比的关系, 深入研究了SDAS对合金拉伸性能、疲劳寿命和疲劳参数的影响。结果表明: 硅颗粒尺寸和形态比与SDAS有很好的线性关系, 当SDAS较大时, 硅颗粒尺寸和形态比也较大, 孔洞尺寸与SDAS之间有类似的关系; SDAS对A319铝合金的杨氏模量和屈服强度几乎没有影响, 而硬度、抗拉强度和延伸率随着SDAS的增大而降低; 疲劳寿命随着SDAS的增大而下降, 疲劳参数也随SDAS的变化而变化: 随着SDAS的增大疲劳强度指数( σ ′ f )增大, 而疲劳强度系数( ε ′ f )、疲劳延性系数( c 0 )和疲劳延性指数( b 0 )减小。

关键词 ：金属材料, A319铝合金, 二次枝晶臂间距, 拉伸性能, 疲劳性能, 微结构

Abstract：

A319 alloy with different secondary dendrite arm spacing (SDAS) was prepared by cutting samples from the cast ingot where locates at different distance from the bottom of the mold. The relationship between SDAS and porosity size, along with the relationship between SDAS and the ratio of size to aspect ratio of Si particles were investigated. Effects of SDAS on tensile properties, fatigue life and fatigue parameters were discussed. The results show that there is a linear relation between the ratio of size to aspect ratio of Si particles and SDAS. When SDAS is larger, Si particle size and the ratio of size to aspect ratio of Si particles, as well as porosity size are larger. SDAS almost had little effect on Young’s modulus and yield strength, while with the increasing SDAS, the tensile strength, elongation and hardness all decrease. Furthermore, with the increasing SDAS, the fatigue life and fatigue parameters such as fatigue strength coefficient ( b 0 ), fatigue ductile coefficient ( σ ′ f ) and fatigue ductile exponent ( ε ′ f ) all decrease, but as an exception, fatigue strength exponent ( c 0 ) increase.

Key words： metallic materials A319 aluminum alloy SDAS tensile properties fatigue behavior microstructure

收稿日期: 2014-03-13

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表1 A319铝合金的化学成分

图1 浇铸模具

图2 拉伸试样尺寸

图3 单轴疲劳试样尺寸

表2 力学性能试验取样参照方法

图4 SDAS与到模具底部距离的关系

图5 不同位置的试样组织

图6 Digimizer软件对硅颗粒的选定效果

图7 硅颗粒与SDAS的关系

图8 孔洞尺寸与SDAS的关系

图9 SDAS对显微硬度的影响

表3 不同SDAS试样的拉伸性能

图10 疲劳寿命与SDAS的关系

图11 3个A319铝合金弹塑性项拟合求解

表4 A319铝合金的疲劳指数与系数

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