A Study of the Response of a Zr-modified 2014 Aluminium Alloy Subjected to Fatigue Loading

机译：Zr改性2014铝合金在疲劳载荷下的响应研究

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The present work illustrates the fatigue response differences of a Zr stabilized Al-Cu alloyrnand the corresponding unmodified one. The fatigue response of the materials has beenrnstudied in both conditions by using a fatigue test machine working at 250 Hz. Thernmechanisms governing fatigue life, cyclic deformation and fracture characteristics arernstudied as a function of the magnitude of the applied stress and intrinsic microstructuralrnevolution. The curve representing the stress amplitude fatigue life response of the materialrnin the Zr stabilised condition showed a classical behaviour with increasing fatigue life asrncyclic stress decreases. A fatigue life of 107 cycles at 110 Mpa was recorded. Thernmicrostructure in the as-received and deformed conditions was characterised by opticalrnand electron microscopy techniques; the crack growth and propagation were determinedrnby scanning electron microscopy observations. The microstructure was characterised byrnvery small equiaxed grains in the cross section respect to the extrusion direction; fracturernsurfaces showed distinct regions of stable crack growth and overload and thernmicromechanisms of damage initiation and propagation were clearly recognised.

机译：本工作说明了Zr稳定的Al-Cu合金与相应的未改性合金的疲劳响应差异。通过使用在250 Hz下工作的疲劳试验机，已经在两种情况下研究了材料的疲劳响应。研究了控制疲劳寿命，循环变形和断裂特性的热力学机理，该机理是所施加应力的大小和固有微结构演化的函数。表示Zr稳定状态下材料的应力振幅疲劳寿命响应的曲线显示出经典的行为，即随着疲劳寿命的增加，循环应力减小。记录了在110 Mpa时107个循环的疲劳寿命。用光学和电子显微镜技术表征了在变形和变形条件下的显微组织。通过扫描电子显微镜观察确定裂纹的扩展和扩展。显微组织的特征是在相对于挤压方向的横截面上有很小的等轴晶晶粒。断裂表面显示出稳定的裂纹扩展和过载的不同区域，并且清楚地识别出损伤的萌生和扩展的微观机制。

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来源
《Materials forum - aluminium alloys, their physical and mechanical properties - Volume 28 - 2004》|2004年|172-177|共6页
会议地点 Brisbane(AU)
作者
P. Cavaliere; E. Cerri; P. Leo;
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作者单位

Dept. of Ingegneria dell'Innovazione, Engineering Faculty, University of Lecce, I-73100-Lecce, Italy;

Dept. of Ingegneria dell'Innovazione, Engineering Faculty, University of Lecce, I-73100-Lecce, Italy;

Dept. of Ingegneria dell'Innovazione, Engineering Faculty, University of Lecce, I-73100-Lecce, Italy;

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原文格式 PDF
正文语种 eng
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关键词
2014+Zr; Fatigue life; FEGSEM; TEM;

机译：2014年+ Zr;疲劳生活； FEGSEM；已;

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机译：受疲劳载荷影响的铝结构设计和制造中的可焊性。第2部分：采用先进mIG和TIG技术的铝合金的可焊性。焊缝几何因素对钢筋疲劳行为的影响

A Study of the Response of a Zr-modified 2014 Aluminium Alloy Subjected to Fatigue Loading

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