Mg-Al-Ca 系チクソモールディング材の粒界および粒内第 2 相によるクリープ強化

Mg-Al-Ca 系チクソモールディング材の粒界および粒内第 2 相によるクリープ強化
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Mg-Al-Ca 基触变成型材料的晶界和晶内第二相引起的蠕变强化

DOI:
10.2320/jinstmet.70.968
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发表时间:
2001
影响因子:
--
通讯作者:
公一 丸山
公一 丸山
中科院分区:
材料科学4区
文献类型:
--
作者:
顕弘 柴田;鈴木 真由美;之欣 附田;研一 斉藤;公一 丸山

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Mg-Al-Ca基合金由α-Mg基体和沿沿着连续分布的共晶化合物组成。用低共熔化合物对晶界的较高覆盖导致高抗蠕变性。由稀土(RE)添加引起的晶内沉淀预期改善合金的抗蠕变性。然而,时效处理产生的沉淀物的结果在晶界覆盖率下降,由于共晶化合物的破碎。研究了不同时效处理条件下含稀土和不含稀土的Mg-Al-Ca合金的蠕变性能,以确定最佳时效条件。将Mg-Al-Ca-RE合金分别在423、473、523和573 K时效24 h,然后在473 K和100 MPa下进行蠕变试验。Mg-Al-Ca-RE合金的蠕变强度高于Mg-Al-Ca合金,这是由于晶内析出相的存在。另一方面,Mg-Al-Ca-RE合金的蠕变速率随着时效温度的升高而增大,这是由于共晶化合物沿晶界沿着破碎和球化所致。进一步提高抗蠕变性是预期的细析出物的分布,这被认为是通过添加高RE含量实现的。
Mg-Al-Ca based alloys consist of the α-Mg matrix and continuous eutectic compounds along grain boundaries. Higher coverage of grain boundaries with the eutectic compounds results in high creep resistance. Intragranular precipitation caused by the rare earth (RE) addition is expected to improve creep resistance of the alloy. However, the aging treatment to produce precipitates results in the decreased grain boundary coverage due to the fragmentation of the eutectic compounds. Creep properties of Mg-Al-Ca alloys with and without RE were investigated after several aging treatments to elucidate the optimum condition of the aging treatments. The Mg-Al-Ca-RE alloy was aged at 423, 473, 523 and 573 K for 24 h respectively, and then was subjected to creep tests at 473 K under 100 MPa. The creep strength of the Mg-Al-Ca-RE alloy was higher than that of Mg-Al-Ca alloy due to the precipitates within grains. On the other hand, the creep rate of the Mg-Al-Ca-RE alloy increases with increasing aging temperature due to the fragmentation and spheroidization of the eutectic compounds along grain boundaries. Further improvement of the creep resistance is expected by the distribution of fine precipitates, which is considered to be achieved by the addition of high RE content.
DOI: 10.2464/jilm.44.549
发表时间: 1994-10
期刊: Journal of Japan Institute of Light Metals
影响因子: --
作者:
祐司 根岸;秀紀 岩澤;重晴 鎌土;陽 小島;隆二 二宮
通讯作者: 祐司 根岸;秀紀 岩澤;重晴 鎌土;陽 小島;隆二 二宮
熔融Mg-Al-Ca合金表面氧化膜的形成
DOI: --
发表时间: 2016
期刊:
影响因子: --
作者:
Yukiya Kato;Atsushi Kitada;Kazuhiro Fukami;Kuniaki Murase;井上晋一
通讯作者: 井上晋一