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Metallographic test for zinc alloy die castings
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Basic data
| Standard ID | GB/T 46786-2025 (GB/T46786-2025) |
| Description (Translated English) | Metallographic test for zinc alloy die castings |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | J31 |
| Classification of International Standard | 77.120.60 |
| Word Count Estimation | 20,299 |
| Date of Issue | 2025-12-02 |
| Date of Implementation | 2026-07-01 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 46786-2025: Metallographic test for zinc alloy die castings
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 77.120.60
CCSJ31
National Standards of the People's Republic of China
Metallographic inspection of zinc alloy die castings
Published on 2025-12-02
Implemented on July 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction IV
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Sample Selection and Preparation 1
5.Test Method 2
6.Inspection Items 2
7.Inspection Report 4.
Appendix A (Informative) Metallographic Atlas of Typical Zinc Alloy Die Castings 6
Appendix B (Informative) Example of Primary Phase Volume Fraction in Zinc Alloy Die Castings (Figure 10)
Appendix C (Informative) Example of primary phase size in zinc alloy die castings (Figure 12)
Reference 14
Figure 1.Schematic diagram of mesh overlay on primary phase image. 3
Figure A.1 Metallographic images of typical grade (YZZnAl4A) zinc alloy die castings 6
Figure A.2 Metallographic images of typical zinc alloy die castings (YZZnAl4B) 6
Figure A.3 Metallographic images of typical zinc alloy die castings (YZZnAl4Cu1) 7
Figure A.4 Metallographic images of typical zinc alloy die castings (YZZnAl4Cu3) 7
Figure A.5 Metallographic images of typical grade (YZZnAl8Cu1) zinc alloy die castings 8
Figure A.6 Metallographic images of typical zinc alloy die castings (YZZnAl11Cu1) 8
Figure A.7 Metallographic images of typical grade (YZZnAl27Cu2) zinc alloy die castings 9
Figure B.1 Example of primary phase volume fraction in zinc alloy die castings (Figure 10)
Figure C.1 Example of primary phase size in zinc alloy die castings (Figure 12)
Table 1.Metallographic Structure Types and Characteristics of Zinc Alloy Die Castings 2
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the National Technical Committee on Foundry Standardization (SAC/TC54).
This document was drafted by. Suzhou Xiangguan Alloy Research Institute Co., Ltd., Anhui Jiuhua New Materials Co., Ltd., and Ganzhou Jinli Wangke.
Technology Co., Ltd., Aikedifule Precision Technology (Jiangsu) Co., Ltd., Changsha Daixiang Auto Parts Technology Co., Ltd., Dongguan Wangjia Hardware
Products Co., Ltd., Zhejiang Wanfeng Motorcycle Wheel Co., Ltd., Shenyang Foundry Research Institute Co., Ltd. of China Academy of Machinery Science and Technology, Shandong Juncheng Metal Science and Technology Co., Ltd.
Technology Co., Ltd., Taicang Inspection and Testing Center, Guangdong Xunyang Technology Co., Ltd., Ji'an Shengfeng Precision Metal Products Co., Ltd.
Futai Metal Technology (Kunshan) Co., Ltd., Jiaxing Hezu Electromechanical Equipment Co., Ltd., Chongqing Yuchuang New Materials Co., Ltd., Zhejiang Songyang Electric Appliance
Limited Liability Company, Meike (Guangzhou) New Materials Co., Ltd., Kunshan Liande Slide Rail Technology Co., Ltd., Zhejiang Suijin Special Casting Co., Ltd.,
Shenyang University of Technology, Dongguan Shijie Huafeng Metal Co., Ltd., Changchun Focus United Die Casting Co., Ltd., Dongfeng (Shiyan) Nonferrous Casting Co., Ltd.
The company, Dongfeng Electronic Technology Co., Ltd. Wuhan Branch, Xinchang County Hongyu Refrigeration Co., Ltd., and the Quality and Metrology Supervision Bureau of Zhaoqing City, Guangdong Province
Testing Institute, Mechanical Industry Molding Materials Important Casting Products Quality Inspection Institute (Shenyang) Co., Ltd., Guangdong Hongtu Technology Co., Ltd.
Shenzhen Kaimo Industrial Co., Ltd., Dongguan Xinghe Precision Technology Co., Ltd., Luxi Lantian High-Tech Co., Ltd., Jiangsu Jiangnan Precision
Mi Metal Materials Co., Ltd., Jiangsu Shuangsheng Zinc Industry Co., Ltd., Shanghai Weilan Power Technology Co., Ltd., Dongguan Litongxing New Energy
Technology company.
The main drafters of this document are. Yang Kang, Chen Jiangbiao, Xu Lin, Chen Haida, Pan Yilei, Jiang Shaojie, Liang Yuhong, Chen Mingsheng, Zhang Jianyu, and Liu Mingwei.
Sun Pu, Liu Jun, Ouyang Zhuang, Jiang Jing, Yan Biaowu, Yang Zhaoling, Li Tao, Liu Zhifa, Chang Yiqian, Gu Xiaofeng, Li Yuanchao, Zhang Jianxiong, Liao Zhongjie
Tang Zhengping, Ouyang Peiying, Liu Chuanping, Huang Hongjun, Shang Erfeng, Xu Dazhong, Shi Song, Zhang Jianbin, Lu Weizhong, Chen Xiulin, Guo Weiliang, Lu Li, Ye Hao,
Tang Haijian, Mei Zefeng, Liu Sijia, Zhang Xiaobing, Yuan Weizhi.
Introduction
Zinc alloy die castings have advantages such as high dimensional accuracy, dense structure, fine grains, and the ability to be assembled with little or no machining.
Therefore, zinc alloy die castings are widely used in electronics, automotive, furniture, medical devices, and electromechanical equipment.
Quality can be inspected through metallographic examination, chemical composition, and mechanical properties. Metallographic examination is the most important method for inspecting the quality of zinc alloy die castings.
One of the direct methods is an essential and important means in the research and development and production of zinc alloy die-casting materials.
To improve the metallographic inspection level of my country's foundry industry and enhance the product quality of zinc alloy die castings, this document collects typical zinc alloy die castings...
The 24 metallographic images of the castings basically cover the metallographic structures of commonly used zinc alloy die castings in my country.
Metallographic inspection of zinc alloy die castings
1 Scope
This document describes the selection and preparation of metallographic test specimens for zinc alloy die castings, the test methods, test items, and test reports.
This document applies to the inspection of microstructure type, primary phase volume percentage, and size of metallographic specimens for zinc alloy die castings.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 5611 Casting Terminology
3 Terms and Definitions
The terms and definitions defined in GB/T 5611 and the following terms and definitions apply to this document.
3.1
primary phase
During the solidification process of zinc alloys, the solid phase preferentially precipitates from the liquid phase.
3.2
primary η phase
During the solidification process of zinc alloys, a small amount of aluminum dissolves in the zinc matrix and preferentially precipitates as a solid phase.
3.3
primary α phase
During the solidification process of zinc alloys, zinc dissolves in the aluminum matrix and preferentially precipitates as a solid phase.
3.4
eutectic structure
Two-phase or multi-phase structures formed by eutectic transformation.
3.5
eutectoid structure
Two- or multi-phase structures formed by eutectoid transformation.
4.Sample selection and preparation
4.1 Metallographic specimens shall be taken from the die-cast part. The sampling location shall be determined according to the product technical requirements or agreed upon by the supplier and the buyer.
4.2 During the cutting and preparation of metallographic specimens, external factors such as specimen deformation or heating should be avoided to prevent them from affecting the microstructure.
4.3 If metallographic specimens require mounting, cold mounting with epoxy resin or dental plaster is recommended. The mounting method can be found in GB/T 13298-
Cold setting method in.2015.
4.4 During the grinding and polishing process of metallographic specimens, external factors such as specimen deformation or heat should be avoided to prevent them from affecting the microstructure. Inspection should be conducted after polishing.
...
