Amount and Distribution of Micro-Defects in Solidified 2219 Al Alloy Ingots: a Metallographic Investigation

• Autorzy: Liu Yu , Huang Yuanchun , Xiao Zhengbing

Identyfikatory

DOI

10.24425/amm.2019.130128

• Języki publikacji: EN

Abstrakty

EN

Micro-defects detection in solidified castings of aluminum alloy has always been a hot topic, and the method employed is mainly depends upon the size and shape of the specimens. In present paper, the amount and distribution characters of micro-defects in a series of 2219 aluminum alloy ingot, with diameters of φ1380 mm, φ1250 mm, φ1000 mm, φ850 mm and φ630 mm, prepared by direct chill casting were investigated by means of metallographic, respectively. Samples were cut along the radius directionfrom slices in the steady casting stage. The result reveals that typical micro-defects are consist of inclusions, porosity and shrinkage under optical microscope, and the total amount of micro-defect per unit area in an ingot slightly decreased with the increase of its diameter. Meanwhile, defects were classified into 2 types according to its size, the results suggesting that defects greater than 40 μm account for the largest proportion among the counted two kinds of defects. Moreover, the distribution of defects greater than 40 μm along the radial direction was detected, its amount increases as its distance from the side, indicating that the micro-defects greater than 40 μm distributed the most in the center zone of ingots and the larger the ingot diameter, the more obvious the tendency was.

Słowa kluczowe

EN

metallographic; micro-defect; 2219 Al alloy ingot; amount; distribution

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2019
• Tom: Vol. 64, iss. 4
• Strony: 1569--1575
• Opis fizyczny: Bibliogr. 28 poz., fot., rys.

Twórcy

autor

Liu Yu

• Central South University, Research Institute of Light Alloy, Changsha, 410083, China
• Central South University, Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Changsha, 410083, China

autor

Huang Yuanchun

• Central South University, Research Institute of Light Alloy, Changsha, 410083, China
• Central South University, College of Mechanical and Electrical Engineering, Changsha 410083, China
• Central South University, Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Changsha, 410083, China

autor

Xiao Zhengbing

• Central South University, Research Institute of Light Alloy, Changsha, 410083, China
• Central South University, Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Changsha, 410083, China

Bibliografia

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Uwagi

EN

The authors gratefully acknowledge the financial supports from NNSFC (Grant No. U1637601), CALT (Grant No. 20171038-056), Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center of Central South University and Guangxi Liuzhou Yinhai Aluminum Co., Ltd. Support and valuable discussion with Mr. Guangze Jia was greatly appreciated.