材料工程
材料工程
재료공정
JOURNAL OF MATERIALS ENGINEERING
2001年
4期
10-15
,共6页
袁广银%曾小勤%吕宜振%丁文江%孙扬善
袁廣銀%曾小勤%呂宜振%丁文江%孫颺善
원엄은%증소근%려의진%정문강%손양선
镁合金%锑%显微组织%力学性能
鎂閤金%銻%顯微組織%力學性能
미합금%제%현미조직%역학성능
研究了锑合金化对镁铝合金Mg-9Al-0.8Zn(AZ91)显微组织和力学性能的影响。结果表明,锑低合金化可以显著提高AZ91合金在从室温至200℃区间内的拉伸屈服强度。用扫描电镜和透射电镜详细分析了试样形变前后的显微组织及其变化,发现在AZ91合金中加入0.1wt%~1.0wt%的Sb后,合金的显微组织得到明显细化。Sb在AZ91合金中的存在方式主要有两种:(1)固溶入β-Mg17Al12相;(2)以Mg3Sb2形式析出,该颗粒相具有六方结构(D52型),有很高的热稳定性,可以作为α-Mg非自发形核的衬底。在此基础上探讨了Sb合金化提高镁铝合金性能的机理:室温下主要是细化基体晶粒产生的晶界强化机制; 高温下则主要通过自生相(Mg3Sb2)粒子的弥散强化机制。
研究瞭銻閤金化對鎂鋁閤金Mg-9Al-0.8Zn(AZ91)顯微組織和力學性能的影響。結果錶明,銻低閤金化可以顯著提高AZ91閤金在從室溫至200℃區間內的拉伸屈服彊度。用掃描電鏡和透射電鏡詳細分析瞭試樣形變前後的顯微組織及其變化,髮現在AZ91閤金中加入0.1wt%~1.0wt%的Sb後,閤金的顯微組織得到明顯細化。Sb在AZ91閤金中的存在方式主要有兩種:(1)固溶入β-Mg17Al12相;(2)以Mg3Sb2形式析齣,該顆粒相具有六方結構(D52型),有很高的熱穩定性,可以作為α-Mg非自髮形覈的襯底。在此基礎上探討瞭Sb閤金化提高鎂鋁閤金性能的機理:室溫下主要是細化基體晶粒產生的晶界彊化機製; 高溫下則主要通過自生相(Mg3Sb2)粒子的瀰散彊化機製。
연구료제합금화대미려합금Mg-9Al-0.8Zn(AZ91)현미조직화역학성능적영향。결과표명,제저합금화가이현저제고AZ91합금재종실온지200℃구간내적랍신굴복강도。용소묘전경화투사전경상세분석료시양형변전후적현미조직급기변화,발현재AZ91합금중가입0.1wt%~1.0wt%적Sb후,합금적현미조직득도명현세화。Sb재AZ91합금중적존재방식주요유량충:(1)고용입β-Mg17Al12상;(2)이Mg3Sb2형식석출,해과립상구유륙방결구(D52형),유흔고적열은정성,가이작위α-Mg비자발형핵적츤저。재차기출상탐토료Sb합금화제고미려합금성능적궤리:실온하주요시세화기체정립산생적정계강화궤제; 고온하칙주요통과자생상(Mg3Sb2)입자적미산강화궤제。
Small amount (0.4wt%-0.7wt%) of Sb addition to the Mg-Al based alloy AZ91(Mg-9Al-0.8Zn) resulted in significant increase in the yield strength at both ambient and elevated temperatures up to 200℃, By using SEM and TEM the change of microstructure of specimens before and after deformation was investigated in detail and the results indicated that the microstructure was fined effectively by the Sb addition. Sb in AZ91 exists in two forms:(1)precipitated in form of Mg3Sb2 particle with hexagonal structure(D52 type); (2) soluted in β-Mg17Al12 phase. Metallographic observation and theory calculation showed that the primary α-Mg could nucleated on Mg3Sb2 particle surface. The reason of improved mechanical properties by Sb was discussed: The RT strengthening mechanism of alloys containing Sb was fine grain strengthening resulted from dispersoids(Mg3Sb2) fining the matrix grain and the improvement of mechanical properties at elevated temperatures mainly resulted from the dispersion strengthening of Mg3Sb2 dispersoids.