Journal of Japan Institute of Light Metals最新文献_第3页

MM-SPSプロセスで作製した純マグネシウムの硬さに及ぼす焼結保持時間の影響烧结保持时间对MM-SPS工艺制备的纯镁硬度的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-10-15 DOI: 10.2464/jilm.73.491

Takumi Inomiya, Masahiro Kubota

{"title":"MM-SPSプロセスで作製した純マグネシウムの硬さに及ぼす焼結保持時間の影響","authors":"Takumi Inomiya, Masahiro Kubota","doi":"10.2464/jilm.73.491","DOIUrl":"https://doi.org/10.2464/jilm.73.491","url":null,"abstract":"Pure magnesium (Mg) powders together with different amounts of process control agent (PCA) were mechanically milled (MMed) using a vibration ball mill. Stearic acid was used as process control agent (PCA) for the mechanical milling (MM) process. The MMed powders were consolidated into bulk materials by the spark plasma sintering (SPS). Changes in hardness and solid-state reactions of the SPS materials have been examined by hardness measurements and an X-ray diffraction (XRD), respectively. A maximum hardness value of 102 HV obtained in the SPS materials fabricated from MMed 24 h powders with PCA1.50 g at sintering temperature of 823 K for 60 min. Formation of MgO by solid-state reaction was observed for the SPS materials consolidated from MMed 24 h powders with PCA1.00 g and 1.50 g. The amount of MgO formation increased with increasing sintering time. No correlation was observed between MgO formation and hardness. The Vickers hardness of the SPS materials improved by increasing sintering temperature. However, no significant change in hardness and constituent phases was observed with increasing sintering time. Pure Mg of hardness can be improved by MM-SPS process.","PeriodicalId":16292,"journal":{"name":"Journal of Japan Institute of Light Metals","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135766343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ゼロカーボン社会構築におけるアルミニウムとその合金の役割と可能性铝及其合金在建设零碳社会中的作用和潜力。

Journal of Japan Institute of Light Metals Pub Date : 2023-09-15 DOI: 10.2464/jilm.73.456

Shin-ichi Kumai

引用次数: 0

Influence of Sr on mechanical properties of Al-2%Si alloys during eutectic solidification Sr对Al-2%Si合金共晶凝固力学性能的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-09-15 DOI: 10.2464/jilm.73.447a

Rio Hirano, Shogo Ozaki, Yoshihiro Nagata, Akira Matsushita, Toshio Sakamoto, Kanta Orio, Yasuhiko Okimura, Toshimitsu Okane, Muhammad Khairi Faiz, Makoto Yoshida

{"title":"Influence of Sr on mechanical properties of Al-2%Si alloys during eutectic solidification","authors":"Rio Hirano, Shogo Ozaki, Yoshihiro Nagata, Akira Matsushita, Toshio Sakamoto, Kanta Orio, Yasuhiko Okimura, Toshimitsu Okane, Muhammad Khairi Faiz, Makoto Yoshida","doi":"10.2464/jilm.73.447a","DOIUrl":"https://doi.org/10.2464/jilm.73.447a","url":null,"abstract":"Al-Si alloys have lower hot tearing susceptibility (HTS) than other aluminum alloys. However, hot tearing occurs under certain casting conditions. It is known that the Sr addition reduces the HTS because of the enhancement of crack-healing. Meanwhile, an influence of Sr addition on the tensile strength, ductility, and viscous properties during eutectic solidification has not yet been clarified. In this study, we investigated the influence of Sr addition on these properties during eutectic solidification. The tensile tests during eutectic solidification were conducted for Al-2Si and Al-2Si-Sr alloys. The results show that the Sr addition did not affect the viscous properties. On the other hand, the tensile strength and elongation during the latter half of eutectic solidification increased by Sr addition. Consequently, the HTS reduction by Sr addition should be attributed to the improvement of ductility. It was suggested that the increase in the elongation by Sr addition should result from the decrease in the tensile stress, which affects the opening and propagation of hot tearing, due to the increase in porosity near the crack.","PeriodicalId":16292,"journal":{"name":"Journal of Japan Institute of Light Metals","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135486905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impurity elements removal technologies by fractional solidification method for recycling aluminum materials 利用分段凝固法去除回收铝材料中杂质元素的技术

Journal of Japan Institute of Light Metals Pub Date : 2023-09-15 DOI: 10.2464/jilm.73.481

Yuichiro Murakami, Keiji Shiga, Naoki Omura

引用次数: 0

Detoxification of impurity elements in recycled aluminum alloys using vertical-type high-speed twin-roll casting and remaining problems for upgrade recycling 利用立式高速双辊铸造法对再生铝合金中的杂质元素进行解毒，以及升级再循环的遗留问题

Journal of Japan Institute of Light Metals Pub Date : 2023-09-15 DOI: 10.2464/jilm.73.470

Y. Harada, Shin-ichi Kumai

引用次数: 0

Effect of simple repair using resin on fatigue life of A6063 aluminum alloy with a simulated crack 树脂简单修复对含模拟裂纹A6063铝合金疲劳寿命的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-08-15 DOI: 10.2464/jilm.73.375

Daisuke Sasaki, Kaishi Naragino, Mochiyuki Yoshitoshi, Toyomitsu Harada, Makoto Nanko, Yuji Kawakami

引用次数: 0

Influence of initial extruded microstructures of Al-4.4Zn-1.4Mg alloy flat bar on VDA bendability Al-4.4Zn-1.4Mg合金扁棒初始挤压组织对VDA弯曲性能的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-08-15 DOI: 10.2464/jilm.73.382

Amalina Aina Kaharudin, Ran Saeki, Mai Takaya, Tadashi Minoda, Tomoyuki Homma

引用次数: 0

Effect of casting conditions on surface defect and segregation of strips cast by a high-speed twin-roll caster 铸造条件对高速双辊连铸带钢表面缺陷和偏析的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-08-15 DOI: 10.2464/jilm.73.393

Kazuki Yamazaki, Toshio Haga

{"title":"Effect of casting conditions on surface defect and segregation of strips cast by a high-speed twin-roll caster","authors":"Kazuki Yamazaki, Toshio Haga","doi":"10.2464/jilm.73.393","DOIUrl":"https://doi.org/10.2464/jilm.73.393","url":null,"abstract":"In this study, the effects of the roll load and superheating on the appearance of surface defects in Al-Mg and Al-Si alloy strips cast using a high-speed twin-roll caster were investigated. The band zone that existed in the center of the thickness direction was investigated. The alloy compositions were Al-4.8%Mg and Al-Si with Si contents of 1, 2, 3 and 11%. The diameter and width of the copper roll in the twin-roll caster were 300 and 50 mm, respectively. The superheating temperature of the molten metal was 5 and 50°C, and the roll load was varied from 2 to 88 N/mm. A roll speed of 30 m/min was utilized. The existence of surface cracks was investigated by penetrant inspection and bending test. The amount of surface cracking in the Al-Mg alloy was affected by the roll load, and the number of surface cracks decreased with decreasing roll load. Surface cracks occurred more easily in the Al-4.8%Mg alloy than in the Al-Si alloys. The degree of cracking could not be reduced by cold-rolling. In the Al-Si alloys, the ripple marks were affected by the Si content and the roll load. In the Al-3%Si alloy, ripple marks were produced, and worsened as the roll load increased. A specimen for observation of the microstructure near the roll bite was obtained by performing a roll-stop during casting, and observed using Weck’ s reagent. A band zone was found to exist. The band zone in Al-Si consisted of globular crystals, and that in Al-Mg consisted of equiaxed dendrites and Mg-richareas.","PeriodicalId":16292,"journal":{"name":"Journal of Japan Institute of Light Metals","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135163440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

異径双ロールキャスターで鋳造したAl-Mg合金板のインライン熱間圧延用异径双滚脚轮铸造的Al-Mg合金板的直排热轧

Journal of Japan Institute of Light Metals Pub Date : 2023-08-15 DOI: 10.2464/jilm.73.389

Toshio Haga, Masataka Furukawa

{"title":"異径双ロールキャスターで鋳造したAl-Mg合金板のインライン熱間圧延","authors":"Toshio Haga, Masataka Furukawa","doi":"10.2464/jilm.73.389","DOIUrl":"https://doi.org/10.2464/jilm.73.389","url":null,"abstract":"A model experiment for in-line hot rolling was proposed, and its effectiveness in reducing surface cracking and improving the mechanical properties of cast strips of AC7A Al-Mg alloy was investigated. The strips were cast using an unequal-diameter twin-roll caster at 60 m/min. The strips had a width of 100 mm, and were immediately cut to a length of 200 mm and hot rolled at temperatures of 300, 350, 400, 450 and 500°C. The temperature of the strip surface was measured using a K-type thermocouple. The center area in the width direction of the strips was hot rolled. The thickness of the as-cast strips was 2 mm, and the width of the rolled region was 20 mm. The roll diameter was 70 mm, and the rolling speed was 15 m/min. The thickness reduction caused by hot rolling ranged from 19 to 42%. Surface cracking was reduced by the in-line hot rolling process. The hot-rolled strips were cold rolled down to a thickness of 0.5 mm and then annealed, and tensile tests were conducted. The in-line hot rolling process induced shear deformation of the microstructure. The most appropriate conditions for in-line hot rolling of AC7A were a thickness reduction of 27% and a temperature of 350°C, judging from the tensile strength and elongation results.","PeriodicalId":16292,"journal":{"name":"Journal of Japan Institute of Light Metals","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135163446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of microstructure on plane bending fatigue properties of frame-retardant magnesium alloy plates and welded joints 微结构对阻燃镁合金板及焊接接头平面弯曲疲劳性能的影响

Journal of Japan Institute of Light Metals Pub Date : 2023-08-15 DOI: 10.2464/jilm.73.400

Naobumi Saito

引用次数: 0