I-DCGAN and TOPSIS-IFP:A simulation generation model for radiographic flaw detection images in light alloy castings and an algorithm for quality evaluation of generated images

The intelligent detection technology driven by X-ray images and deep learning represents the forefront of advanced techniques and development trends in flaw detection and automated evaluation of light alloy castings.However,the efficacy of deep learning models hinges upon a substantial abundance of flaw samples.The existing research on X-ray image augmentation for flaw detection suffers from shortcomings such as poor diversity of flaw samples and low reliability of quality evaluation.To this end,a novel approach was put forward,which involves the creation of the Interpolation-Deep Convolutional Generative Adversarial Network(I-DCGAN)for flaw detection image generation and a comprehensive evaluation algorithm named TOPSIS-IFP.I-DCGAN enables the generation of high-resolution,diverse simulated images with multiple appearances,achieving an improvement in sample diversity and quality while maintaining a relatively lower computational complexity.TOPSIS-IFP facilitates multi-dimensional quality evaluation,including aspects such as diversity,authenticity,image distribution difference,and image distortion degree.The results indicate that the X-ray radiographic images of magnesium and aluminum alloy castings achieve optimal performance when trained up to the 800th and 600th epochs,respectively.The TOPSIS-IFP value reaches 78.7%and 73.8%similarity to the ideal solution,respectively.Compared to single index evaluation,the TOPSIS-IFP algorithm achieves higher-quality simulated images at the optimal training epoch.This approach successfully mitigates the issue of unreliable quality associated with single index evaluation.The image generation and comprehensive quality evaluation method developed in this paper provides a novel approach for image augmentation in flaw recognition,holding significant importance for enhancing the robustness of subsequent flaw recognition networks.

Rare Earth Metals in Light Alloys

A review of crystallochemical thermodynamic and phase diagram data of Mg RE and Al RE based systems is presented. On the basis also of their possible applications, special attention is given to the Mg rich and Al rich alloys and to the effects of rare earth additions on their properties. A summary of the experimental work carried out by our research group on several binary and ternary alloys is reported: that is Mg RE, Al RE, and Mg RE RE′ and Al RE RE′ with two different rare earth metals. A number of regularities observed in the formation and in the crystallochemistry of binary and ternary Mg rich or Al rich phases are summarised and discussed. Their application to a fine planning of alloys having a well defined structure is suggested.

DC casting of light alloys under magnetic fields

The working principle of LFEC（Low frequency electromagnetic casting） process developed in Northeastern University, China was introduced and the metallurgical results of LFEC were discussed according to the casting practices. The low frequency field around the mold produces Lorenz force, which can be divided into two parts： one is the potential force which will be balanced by a pressure gradient of the liquid and results in the formation of a convex surface meniscus and improves the surface quality; the other is the rotary force which stirs the liquid in the mold to refine the microstructures and homogenize the distribution of alloying elements. LFEC can refine microstructures remarkably, improve surface quality of the ingots, depress macrosegregation and eliminate cracks. Some new technologies, such as horizontal direct chill casting under low-frequency electromagnetic field （HLEC）, DC casting of hollow billets under electromagnetic fields （HBEC）, electromagnetic modifying of hypereutectic A1-Si alloys（EMM）, air film casting under static magnetic field （AFCM）, and multi-ingots casting under low-frequency magnetic field （MLFEC） were developed based on LFEC.

Superhydrophobic Light Alloy Materials with Corrosion-Resistant Surfaces

Metals and their alloys are irreplaceable engineered materials showing great importance in our society.Light alloy materials(i.e.,Mg,Al,Ti,and their alloys)have tremendous application potential in the aerospace,automotive industries,and biomedical fields for they are lighter and have excellent mechanical properties.The corrosion of light alloys is ubiquitous and greatly restricts their utilization.Inspired by the natural anti-water systems,many new designs and conceptions have recently emerged to create artificial superhydrophobic surfaces with great potential for corrosion resistant of light alloy.This review firstly introduces the concept of superhydrophobicity and strategies of producing superhydrophobic surfaces to inhibit the corrosion of light alloys.In addition,we elaborate the durability of superhydrophobic light alloy materials for commercial and industrial applications,and present their anticorrosion mechanism in the corrosive media.

Chaohu Yi＇an Yunhai Technology Co., Ltd. light alloy diecasting project is completed and put into production

On November 16, the light alloy precision die-casting project （Phase I） constructed by Chaohu Yi＇an Yunhai Technology Co., Ltd. was completed and put into production. The main products are new energy automotive components, 5G product components and laptop shells. Chaohu Yi＇an Yunhai Technology Co., Ltd. is a joint venture funded by Dongguan Yi＇an Technology Co., Ltd. and Nanjing Yunhai Special Metals Co., Ltd., with a total investment of CNY 550 million and a building area of 75,000 square meters.

The present and future of the magnesium alloy researches

This paper gave a brief discussion on the characteristics of Mg alloys and gave a brief review in the Mg alloys researches, with emphasis on the research progress and fabrication technology. Several vital directions for the future development were pointed out.

Manufacturing of Long Products Made of Innovative Lightweight Materials

The processing of innovative lightweight materials to sheet metal components and assemblies with globally or locally defined properties is the object of this work. It takes a load-dependent design of components and assemblies, for example, based on the composition of different construction materials or a targeted setting of component areas with specified characteristics to fully exploit the lightweight potential when substituting conventionally used materials. Different process chains for the manufacturing of roll-formed long products made of magnesium alloys and high-strength steels with locally defined properties will be presented in this paper. Depending on the kind of material to be formed and the desired product characteristics, different temperature managements are needed for capable processes. Due to limited formability at room temperature, magnesium alloys require a heating of the forming zones above 200–225 °C throughout the bending process in order to activate additional gliding planes and to avoid any failures in the radii. The realization of local hardening effects requires at least one process-integrated heat treatment when roll forming manganese–boron steels. For both processes, it is imperative to realize a heating and cooling down or quenching appropriate for the manufacturing of long products with the required quality. Additionally, proper line speeds that allow a continuously operated economical production have to be considered. Research results including design, FEA, realization and experimentation of the mentioned process chains and strategies will be described in detail.