文章信息/Info

Title:

Progress in the Investigation of Microstructure Evolution in Mg Alloys Using Synchrotron Radiation Imaging Technique

文章編號(hào):

1674-3962(2021)05-0339-13

作者:

王沖; 郭恩宇; 王同敏

(大連理工大學(xué)材料科學(xué)與工程學(xué)院 遼寧省凝固控制與數(shù)字化制備技術(shù)重點(diǎn)實(shí)驗(yàn)室，遼寧 大連 116024)

Author(s):

WANG Chong;  GUO Enyu;  WANG Tongmin

（Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China）

關(guān)鍵詞:

鎂合金; 同步輻射; 微結(jié)構(gòu); 力學(xué)行為; 腐蝕性能

Keywords:

Mg alloy;  synchrotron radiation;  microstructure;  mechanical behavior;  corrosion property

分類號(hào):

TG146.22

DOI:

10.7502/j.issn.1674-3962.202101016

文獻(xiàn)標(biāo)志碼:

A

摘要:

鎂合金是當(dāng)前大規(guī)模應(yīng)用的最輕的金屬結(jié)構(gòu)材料，深入闡釋鎂合金在制備和服役環(huán)境下的微結(jié)構(gòu)（如組織、缺陷等）演變機(jī)制是獲得高性能鎂合金制品的重要基礎(chǔ)。同步輻射成像技術(shù)具備較高的時(shí)間和空間分辨率，可對(duì)鎂合金在制備過(guò)程和模擬服役環(huán)境下的微結(jié)構(gòu)演變行為實(shí)行原位動(dòng)態(tài)觀察。綜述了同步輻射成像技術(shù)在探究鎂合金微結(jié)構(gòu)演變機(jī)制方面的應(yīng)用，重點(diǎn)闡述了鎂合金在凝固相變過(guò)程中的晶體演化行為、復(fù)雜加載條件下的裂紋形成與擴(kuò)展和生物腐蝕環(huán)境下的組織演變。總結(jié)發(fā)現(xiàn)，合金元素及凝固條件的改變影響枝晶晶體形貌；在復(fù)雜載荷條件下，鎂合金中微裂紋多依附于第二相粒子表面形核并沿著第二相粒子聚集處擴(kuò)展；生物腐蝕環(huán)境下，鎂合金表現(xiàn)出良好的生物相容性，通過(guò)表面改性等手段可實(shí)現(xiàn)對(duì)鎂合金降解速率的調(diào)控。其后，淺析了同步輻射成像技術(shù)在這些研究領(lǐng)域的優(yōu)勢(shì)和局限性，有望為鎂合金及其他眾多合金的微結(jié)構(gòu)演化研究提供新的思路。最后，進(jìn)一步展望了未來(lái)同步輻射成像技術(shù)在鎂合金領(lǐng)域的應(yīng)用研究。

Abstract:

Mg alloys are the lightest metal structure material for large-scale applications. Elucidating the evolution mechanisms of Mg alloy‘s microstructures during preparation and service condition is critical to obtain high performance magnesium alloy products. Synchrotron radiation imaging technique with high temporal and spatial resolution can realize in-situ dynamic observation of microstructure evolution of alloys during preparation and in simulated service environment. This article reports the recent research progress in the microstructure evolution mechanisms of Mg alloy with the application of synchrotron radiation imaging technique. The crystal evolution behavior of Mg alloys during solidification, the formation and propagation of cracks under complex loading condition and microstructure evolution in biocorrosive environment are discussed. The magnesium alloy dendrite morphology is influenced by alloying elements and solidification conditions. Microcracks are inclined to initiate on the second phase surface and extend along the particles aggregation area. Mg alloys show good biocompatibility under biological corrosion environment, and the degradation rate can be controlled by surface modification. In addition, the advantage and limitation of synchrotron radiation imaging technique in these research are analyzed briefly, providing a new promising way for the investigation of microstructure in Mg alloy and other alloys. In the end, the research trends of synchrotron radiation imaging technique in the study of Mg alloys are prospected.