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Glass transition and visco-elastic behavior of new amorphous light-metal alloys in Al- and Mg-based systems

铝基和镁基体系中新型非晶轻金属合金的玻璃化转变和粘弹性行为

基本信息

批准号：
01430013
负责人：
MASUMOTO Tsuyoshi
金额：
$ 13.31万
依托单位：
Tohoku Nniversity
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01430013/
关键词：
amorphous alloy glass transition supercooled liquid visco-elastic behavior structural relaxation storage modulus loss modulus relaxation time アルミニウム基合金マグネシウム基合金

项目摘要

1. The change in the supercooled liquid region for Mg_<65>Cu_<25>Ln_<10>(Ln=Y, La, Ce, Nd, Sm, Tb or Gd) amorphous alloys with Ln elements was systematically examined and the Mg_<65>Cu_<25>Tb_<10> amorphous alloy was found to have a wide supercooled liquid region (*Tx) reaching 75K.2. We succeeded in producing a bulky Mg_<65>Cu_<25>Tb_<10> alloy by a metallic mold casting process. The viscosity of the amorphous bulk decreases rapidlyin the temperature range above Tg and is as low as 10^7 Pa・s at a temperature just below Tx.3. We searched a new amorphous alloy exhibiting a further wide supercooled liquid region and found that Zr=Al-TM amorphous alloys have a wide supercooled liquid region before crystalization. The largest *Tx value attained is 127K for Zr_<65>Al_<7.5>Ni_<10>Cu_<17.5>.4. We also succeeded in producing an amorphous phase in Gd-Al-Ni system containing a ferromagnetic Gd element as a major component. The glass transition was observed in the composition range of 10 to 35%Ni and 10 to 35% Al and the largest *Tx was 65K for Gd_<55>Al_<25>Ni_<20>.5. The dynamical mechanical properties were examined for La_<55>Al_<25>Ni_<20> amorphous alloys and the loss modulus E"(T) was found to show two distinguishable peaks consisting of a main peak at 509K and a subpeak at 491K.Furthermore, the storage modulus E'(T) and the E"(T) as a function of frequency were examined. As the frequency decreases, the main peak in the E"(T) curve shifts to a lower temperature side, leading to the appearance of two-distinguishable peaks. It is therefore concluded that the relaxation in the glass transition and supercooled liquid region occurs through two different relaxation processes.

1.系统地研究了Mg_<65>Cu_<25>Ln_<10>（Ln=Y，La，Ce，Nd，Sm，Tb或Gd）非晶合金中加入Ln元素后的过冷液相区的变化，发现Mg_ Cu_ Tb_（Ln = Y，La，Ce，Nd，Sm，Tb或Gd<65><25>）<10>非晶合金具有很宽的过冷液相区（*Tx），可达75 K。采用金属型铸造工艺成功地制备出了大体积Mg_<65>Cu_<25>Tb_（1-x）<10>合金.在高于Tg的温度范围内，非晶块体的粘度迅速下降，在低于Tx的温度下，粘度低至10^7 Pa·s。我们寻找了一种表现出更宽的过冷液态区的新非晶合金，发现Zr=Al-TM非晶合金在结晶前具有更宽的过冷液态区。对于Zr_ Al_ Ni_ Cu_（0.4），获得的最大 *Tx值为127 K<65><7.5><10><17.5>。我们还成功地在Gd-Al-Ni系统中产生了一个非晶相，其中含有铁磁Gd元素作为主要成分。在10 - 35%Ni和10 - 35%Al的组成范围内观察到玻璃转变，对于Gd_ Al_ Ni_（0.5），最大的 *Tx为65 K<55><25><20>。研究了La_ Al_ Ni_（1-x）非晶合金的动态力学性能<55><25><20>，发现损耗模量E”（T）在509 K处有一个主峰，在491 K处有一个次峰。此外，还研究了储能模量E '（T）和E”（T）与频率的关系。随着频率降低，E”（T）曲线中的主峰向低温侧移动，导致出现两个可区分的峰。因此，可以得出结论，在玻璃化转变和过冷液相区的弛豫发生通过两个不同的弛豫过程。