Invention of high performance magnesium alloys with trade-off balancing by multi-scale controlling

通过多尺度控制权衡平衡发明高性能镁合金

• 批准号: 11225209
• 负责人: HIGASHI Kenji
• 金额: $ 49.34万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11225209/
• 关键词: Multi-scale controlling; Trade-off balancing; The first principle molecular dynamics; Refinement processing; Crystallographic orientation control Diffusion bonding; Press formability; Notch sensitivity; 切欠き感受性; 拡散接合; プレス成形性; マルチスケール制御プロセス; トレード

This research purpose is the invention of the high performance magnesium alloys, which are trade-off balanced by multi-scale controlling from electron or atomic level to macroscopic level. The results are summarizes to below.(1)In "the analysis for deformation behavior and an alloy design by the first principle molecular dynamics calculation", the big difference in the critical resolved shear stress between basal and prismatic slip planes, which leads to the brittle-nature of magnesium, was discussed from the results by theoretical calculation on the generalized stacking fault energy in ideal slip deformation of each single crystal. As the result it was found that an addition of Li, Al or Zn could make the difference small. Moreover, the anisotropy of the bonding strength was discussed from the electron density distribution.(2)In "the construction of the materials process for the alloy having an excellent in mechanical property and formability", an improvement in the impact properties … More was attained by the uniform distribution in fine Zr-precipitates and the grain refinement on the Mg-Zn system alloy processed by equal-channel-angular-extrusion (ECAE). Moreover, the strain-rate reverse dependency of the elongation was found in the ECAE processed Mg-AI system alloy (AZ31) by the achievement of grain refinement and texture control, and improvement in no less than 50% elongation was attained under an impact strain-rate of 1.8 x 10^3 s^<-1> at room temperature. Moreover, it was shown clearly that low temperature or high-strain-rate superplasticity could be discovered in various alloys.(3)In "the establishment of the diffusion bonding and the friction stir welding technology", the equation describes the diffusion bonding condition was drawn from the cavity-disappearance model in the compressive superplastic deformation, and it was shown that the bonding strength of AZ31 alloy sufficient in one third of the bonding time of aluminum under an optimal condition could be obtained. Moreover, although, as for pure magnesium, sufficient bonding strength was not obtained in friction stir welding, with the alloy, 90% or more of the bonding strength of mother material was obtained.(4)In "the establishment of the press fabrication technology from rolling sheets", it was found that the forming limit depended on the fracture limit of the tensile bending on the punch shoulder, and it improved by heating at 473 K or less. Moreover, it was shown that the local deformability, which was hard to evaluate by the tensile test, was important to obtain the good press fabrication, and the new method to evaluate the formability by a notched-specimen bending test was proposed. Less

这项研究目的是高性能合金的意图，这些合金通过从电子或原子水平到宏观水平的多尺度控制而平衡。结果总结为以下。（1）在“对第一个原理分子动力学计算的变形行为和合金设计的分析”中，在基本和尖利的滑移平面之间的临界剪切应力之间的巨大差异，从而导致镁的脆性基础，从而通过对总体堆栈缺陷的理论进行理论来讨论镁的脆性。结果，发现添加Li，Al或Zn可能会使差异很小。 Moreover, the anisotropy of the bonding strength was discussed from the electron density distribution.(2)In "the construction of the materials process for the alloy having an excellent in mechanical property and formability", an improvement in the impact properties … More was attached by the uniform distribution in fine Zr-precipitates and the grain refinement on the Mg-Zn system alloy processed by equal-channel-angular-extrusion (ECAE).此外，通过实现晶粒细化和纹理控制的ECAE处理的MG-AI系统合金（AZ31），在ECAE处理的MG-AI系统合金（AZ31）中发现了应变率的反向依赖性，并且在室温下的1.8 x 10^3 s^<-1>下，在室温下的1.8 x 10^3 s^<-1>下，在不少于50％的伸长率中提高了伸长率的改善。此外，清楚地表明，在各种合金中可以发现低温或高应变率的超塑性。（3）在“建立扩散键合和摩擦搅拌焊接技术”中，该方程描述了扩散键合的条件，从型号中的一个足够的键合中绘制了整个键合的键合，并以键合的三分之一的键合构图，并在一个键中所示，它的一部分是A的一个键合，并且是A的一部分。可以在最佳条件下铝的时间。此外，尽管在纯镁方面，在摩擦搅拌焊接中未获得足够的粘结强度，但使用合金，获得了90％或更多的母材料的粘结强度。（4）“从滚动板上建立新闻制造技术”时，发现形成极限依赖于Tensile limitive the 33左右的加热，并依赖于4的倾斜度，并在4上加油，并在4上加热。此外，结果表明，通过拉伸测试很难评估的局部变形性对于获得良好的压力制造很重要，并且提出了通过刻痕的特异性弯曲测试评估可调节性的新方法。较少的

项目成果

S.W.Chung: "Superplastic Deformation Behavior in the Commercial AZ61 Mg Alloy during Biaxial Gas-pressure Forming"Materials Science Forum. 419-422. 539-544 (2003)

S.W.Chung：“商业 AZ61 镁合金在双轴气压成形过程中的超塑性变形行为”材料科学论坛。

H.Somekawa: "Diffusion bonding in superplastic magnesium alloys"Materials Science and Engineering. A339. 328-333 (2003)

H.Somekawa：“超塑性镁合金中的扩散接合”材料科学与工程。

Uesugi, Tokuteru: "Generalized Stacking Fault Energy and Dislocation Properties for Various Slip Systems in Magnesium : a First-Principles Study"Materials Science Forum. 419-422. 225-230 (2003)

Uesugi、Tokuteru：“镁中各种滑移系统的广义堆垛层错能量和位错特性：第一性原理研究”材料科学论坛。

H.Watanabe: "Grain Size Control of Commercial Wrought Mg-Al-An Alloys Utilizing Dynamic Recrystallization"Materials Transactions. 42-7. 1200-1205 (2001)

H.Watanabe：“利用动态再结晶控制商用变形 Mg-Al-An 合金的晶粒尺寸”材料交易。

H.Watanabe: "Workability Utilizing Superplastic Flow in Magnesium-Based Materials"Kagakuto Kogyo. 74-5. 227-233 (2000)

H.Watanabe：“在镁基材料中利用超塑性流动的可加工性”Kagakuto Kogyo。