著者
千野 靖正 下島 康嗣 山田 康雄 文 翠娥 馬渕 守
出版者
公益社団法人 日本材料学会
雑誌
材料 (ISSN:05145163)
巻号頁・発行日
vol.50, no.11, pp.1228-1232, 2001-11-15 (Released:2009-06-03)
参考文献数
23
被引用文献数
3 2

In the present investigation, open die forging tests have been conducted for AZ31 and ZK60 Mg alloys. Microstructure and mechanical properties of the forged Mg alloys have been investigated. Cylindrical specimens with a diameter of 18mm and a height of 18mm were forged in a temperature range of 323 to 673K. The forged specimens of both Mg alloys had good surface quality at high forging temperatures of more than 573K. Microstructural observation revealed that grains were recrystallized by hot forging, though unrecrystallized grains were partially found. The recrystallized grain area for AZ31 was larger than that for ZK60. The mean size of the recrystallized grains decreased with decreasing forging temperature. In particular, a very small grain size of about 3μm was attained by forging at 473K. As a result of tensile tests, it has been found that ultimate tensile strength and 0.2% proof stress of the forged Mg alloys increased with a decrease in forging temperature. This was related to grain refinement by hot forging.
著者
千野 靖正 黄新 胜 鈴木 一孝
出版者
公益社団法人 日本金属学会
雑誌
日本金属学会誌 (ISSN:00214876)
巻号頁・発行日
vol.81, no.2, pp.49-54, 2017-02-01 (Released:2017-01-25)
参考文献数
41
被引用文献数
11

Magnesium (Mg) alloys are suitable materials for weight reduction in vehicles because of their low densities and high specific strengths. However, rolled Mg alloy sheets generally exhibit a poor formability at room temperature and thus their applications are restricted. This poor formability is originated from basal slip dominated deformation as well as strong basal texture. It is known that the formability can be improved by suppression of basal texture formation. Thus, large efforts have been devoted to texture control for the purpose of enhancing the room temperature formability. In this paper, recent researches for texture control of rolled Mg alloy sheets are reviewed.0