Dispersoid-strengthened aluminum alloys for high temperature applications by microalloying transition elements of Zr, V, Cr, Mo and Sc

通过微合金化过渡元素 Zr、V、Cr、Mo 和 Sc 实现高温应用的弥散体强化铝合金

基本信息

批准号：
RGPIN-2015-05269
负责人：
Chen, XGrant
金额：
$ 2.19万
依托单位：
Université du Québec à Chicoutimi
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2020
资助国家：
加拿大
起止时间：
2020-01-01 至 2021-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708157
关键词：
Dispersoid strengthened aluminum alloys temperature

项目摘要

The demand for aluminum alloys working at high temperatures (250 - 350 oC) has been greatly increased in recent years, driven by the automotive and aerospace industries requiring high strength, low cost and light components. The design of sub-micro and nano scale dispersoids in aluminum matrix is a powerful avenue to improve the strength and creep resistance at high temperatures. From our preliminary work at UQAC, it is seen that some transition elements can form either binary dispersoids (Al3M-type) during solidification and heat treatment or form more complex ternary or quaternary dispersoids in the presence of Mn, Si and Fe alloying elements, which often are thermodynamically and kinetically stable at temperatures well in excess of 300 oC. Among others, the individual and combined additions of microalloying transition elements of Zr, V, Cr, Mo and Sc are especially attractive due to high elastic modulus, high melting points, low diffusivity and relatively low cost. It is intended to select two model alloys - a wrought alloy (in 3xxx series) for deformed aluminum products and a foundry alloy (Al-Si-Mg-type) for castings - for developing dispersoid-strengthened aluminum alloys with high-temperature stability and high strength. The thermodynamic computation using the Thermo-Calc software will be first conducted to predict the phase formation and microstructure during solidification and heat treatment. The microstructures of two alloys at as-cast and heat-treated conditions with microalloying elements will be analyzed using thermal Analysis (TA), differential scanning calorimetry (DSC), optical microscopy, scanning electron and transmission electron microscopes (SEM and TEM). The dispersoid strengthening effect by individual and combined additions of Zr, V, Cr, Mo and Sc will be characterized in term of mechanical properties and creep resistance at the temperature range of 250 - 350 oC. The long term thermal stability of dispersoid-strengthened alloys will be evaluated after 1000 - 2000 h annealing at 300 oC.

近年来，这是由于汽车和航空航天行业需要高强度，低成本和轻型组件的驱动，对高温（250-350 oC）的铝合金的需求大大增加。铝制基质中亚微米和纳米尺度分散剂的设计是提高高温下强度和蠕变抗性的强大途径。从我们在UQAC的初步工作中可以看出，在固化和热处理期间，某些过渡元素可以形成二元分散剂（AL3M型），或者形成在Mn，Si和Fe合金元素存在下，通常在热力学和Kinet上稳定的稳定性稳定的三分或四元分散剂，这是高度稳定的300 00 coc。除其他外，由于较高的弹性模量，高熔点，低扩散率和相对较低的成本，ZR，V，CR，MO和SC的单个和合并的过渡元素的添加特别有吸引力。它旨在为变形的铝产品选择两种型号合金（3xxx系列）和一种用于铸造的铸造合金（Al-Si-MG型） - 用于开发具有高温稳定性和高强度和高强度的分散性增长铝合金。首先将使用Thermo-CALC软件进行热力学计算，以预测固化和热处理期间的相位形成和微观结构。将使用热分析（TA），差分扫描量热法（DSC），光学显微镜，扫描电子和透射电子显微镜（SEM和TEM）分析两种合金和与微合同元件的两种合金的微观结构。 ZR，V，CR，MO和SC的分散性增强效果将以机械性能和250-350 oC的温度范围的迫阻力为特征。 1000-2000 h以300 oC退火后，将评估分散性合金的长期热稳定性。