| Summary: | Based on the facts that there are many kinds of metallic tensile specimens with different dimensions, a set of rectangular cross-section and round cross-section tensile specimens are designed according to China national standard GB228-2002 which is called metallic materials’ tensile testing at ambient temperature to meet the needs of routine materials researching and testing in factory. According to the designing specimen, a complete set of permanent die was designed and manufactured. Then, Al-Mg alloy was chosen to do the casting processing experiment, and the tensile specimen was obtained and tensile test was finished. It showed that the designing specimen and permanent die met the requirements of tensile test. The round specimen is stronger than the rectangular one and the particles diameter of the studied Al-Mg alloy is from 20μm to 50μm.
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