Al-Zn-Mg-Cu-Sc-Zr合金短时间均化微观结构演变研究

需积分: 8 161 浏览量更新于2024-08-26 收藏 338KB PDF 举报

Microstructural Evolution in Al-Zn-Mg-Cu-Sc-Zr Alloys during Short-time Homogenization 本研究论文旨在探究一种新的铝合金（Al–8.82Zn–2.08Mg–0.80Cu–0.31Sc–0.3Zr）在短时间均化处理中的微观结构演化过程。研究结果表明，在470°C温度和1小时的短时间均化处理后，二次相MgZn2完全溶解到基体中，而一级相Al3(Sc,Zr)仍然保持不变。在材料科学领域中，合金的微观结构演化过程对其性能有着重要的影响。铝合金是一种广泛应用于航空航天、汽车、建筑等领域的材料，其性能直接影响到这些行业的发展。因此，研究铝合金的微观结构演化过程对于提高其性能和应用价值具有重要的意义。在本研究中，作者使用了短时间均化处理来研究铝合金的微观结构演化过程。短时间均化处理是一种常用的热处理方法，可以有效地改善合金的微观结构和性能。在短时间均化处理过程中，合金中的二次相MgZn2完全溶解到基体中，而一级相Al3(Sc,Zr)仍然保持不变。这意味着，短时间均化处理可以有效地改善铝合金的微观结构和性能。此外，研究还表明，铝合金的微观结构演化过程还受到其他因素的影响，如温度、时间、合金成分等。因此，为了提高铝合金的性能和应用价值，需要进一步研究和探究其微观结构演化过程的机理和影响因素。本研究论文对铝合金的微观结构演化过程进行了深入的研究和探究，为提高铝合金的性能和应用价值提供了重要的参考价值。同时，本研究也为材料科学领域的发展和创新提供了重要的贡献。知识点： 1. 铝合金的微观结构演化过程对其性能有着重要的影响。 2. 短时间均化处理可以有效地改善铝合金的微观结构和性能。 3. 铝合金的微观结构演化过程受到温度、时间、合金成分等因素的影响。 4. 为了提高铝合金的性能和应用价值，需要进一步研究和探究其微观结构演化过程的机理和影响因素。资源链接： * International Journal of Minerals, Metallurgy and Materials, Volume 22, Number 5, May 2015, Page 516 * DOI: 10.1007/s12613-015-1101-3

International Journal of Minerals, Metallurgy and Materials

Volume 22, Number 5, May 2015, Page 516

DOI: 10.1007/s12613-015-1101-3

Corresponding author: Nai-qin Zhao E-mail: nqzhao@tju.edu.cn

Microstructural evolution in Al–Zn–Mg–Cu–Sc–Zr alloys during short-time

homogenization

Tao Liu

, Chun-nian He

1,2)

, Gen Li

, Xin Meng

, Chun-sheng Shi

, and Nai-qin Zhao

1,2)

1) Department of Materials Science and Engineering, Tianjin University; Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, China

2) Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

(Received: 15 September 2014; revised: 27 November 2014; accepted: 1 December 2014)

Abstract: Microstructural evolution in a new kind of aluminum (Al) alloy with the chemical composition of Al–8.82Zn–2.08Mg–

0.80Cu–0.31Sc–0.3Zr was investigated. It is found that the secondary phase MgZn

is completely dissolved into the matrix during a short

homogenization treatment (470°C, 1 h), while the primary phase Al

(Sc,Zr) remains stable. This is due to Sc and Zr additions into the Al al-

loy, high Zn/Mg mass ratio, and low Cu content. The experimental findings fit well with the results calculated by the homogenization diffusion

kinetics equation. The alloy shows an excellent mechanical performance after the short homogenization process followed by hot-extrusion

and T6 treatment. Consequently, a good combination of low energy consumption and favorable mechanical properties is obtained.

Keywords: aluminum alloys; microstructural evolution; short-time; homogenization; grain refinement

1. Introduction

Al–Zn–Mg–Cu (7xxx series) alloys have been widely

used in the aeronautical and manufacturing industries be-

cause of their high strength, sufficient stress corrosion

cracking resistance (SCC), and satisfactory plasticity [1–2].

However, the disadvantages caused by the non-equilibrium

phases consisting of Zn, Mg, and Cu elements, which form

during casting, are also obvious; these disadvantages include

a severe cracking tendency, which leads to a great reduction

in strength and toughness after heat treatment and mechani-

cal deformation, along with poor SCC resistance. In order to

prevent from microsegregation and dissolve the secondary

phases, homogenization heat treatment is essential. Many

researchers have focused on the optimum homogenization

treatment parameters [3–8]; Li et al. [3] claimed that the op-

timum temperature and duration of homogenization for

Al–Zn–Mg–Cu–Sc–Zr alloys are 470°C and 24 h, respec-

tively. Deng et al. [7] designed a three-stage homogeniza-

tion heat treatment for Al–Zn–Mg–Cu alloys consisting of a

small amount of trace Zr. However, based on these refer-

ences, energy depletion and poor operation may be caused

by the long holding time (12–48 h) and the complex ho-

mogenization process (more than one step) in industrial

production.

Previous studies have shown that Sc and Zr are the most

efficient modification agents among all microalloying addi-

tions to Al [9–12]. By adding Sc and Zr to Al alloys, the

equiaxed grains and uniformly distributed second phase par-

ticles will form in the as-cast alloy rather than as long den-

drites [13–17]. Consequently, both the diffusion distance of

the alloying elements and the homogenization treatment pe-

riod can be shortened, which is beneficial for increasing the

efficiency and reducing the energy consumption.

In this work, the microstructural evolution of an

Al–Zn–Mg–Cu–Sc–Zr alloy during homogenization was

studied. It is found that after a short homogenization treat-

ment, the alloy reaches a homogeneous state. The observed

findings fit well with the results of the homogenization dif-

fusion kinetic equation.

2. Materials and methods

A semi-continuous ingot with the diameter of 60 mm

下载后可阅读完整内容，剩余7页未读，立即下载

weixin_38650951

粉丝: 5
资源: 927

Al-Zn-Mg-Cu-Sc-Zr合金短时间均化微观结构演变研究

Characteristics of microstructural evolution during deformation-enhanced ferrite transformation in Nb-microalloyed HSLA steel (2007年)

Microstructural evolution in electroformed nickel shaped-charge liners with nano-sized grains undergone deformation at ultrahigh strain rate (2010年)

Microstructural evolution during aging of Ti-10V-2Fe-3Al titanium alloy (2007年)

Modeling of microstructural evolution during dynamic recrystallization in coarse Nb microalloyed austenite (2007年)

共电沉积Cu-Zn-Sn前驱体合成Cu2ZnSnS4薄膜及其微观结构和光学性质

Elle Microstructural Modelling-开源

Dissolution-precipitation mechanism of self-propagating high-temperature synthesis of TiC-Cu cermet (2007年)

Production of ultra-transparent glass-ceramics via controlled crystallization of nanocrystals in the glassy matrix of LAST (2014年)

The interaction of multifold polar orderings in Ba-doped Sr"0"."7Ca"0"."3TiO"3

plasma-sprayed zirconia coatings

最新资源