Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第5期    总第146期    2011年5月

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文章编号:1004-0609(2011)05-1052-08
Cu-12%Al合金线材的马氏体结构及其对力学性能的影响
刘锦平1, 2, 刘雪峰1, 2,黄海友1, 2,谢建新1, 2

(1. 北京科技大学 材料先进制备技术教育部重点实验室,北京 100083;
2. 北京科技大学 新材料技术研究院,北京 100083
)

摘 要: 采用连续定向凝固技术制备Cu-12%Al(质量分数)合金线材,通过改变熔体温度获得不同结构的马氏体,研究马氏体取向和形貌对线材力学性能的影响。结果表明:在引拉速度为10 mm/min、冷却水温为20 ℃、水流量为400 L/h、熔体温度为1 150或1 200 ℃的条件下所制备的直径为6 mm的Cu-12%Al线材均为马氏体组织。熔体温度为1 150 ℃时,定向凝固线材马氏体的母相择优生长面为(100)和 ,马氏体形貌呈枝状和片状,线材的伸长率为5.1%,断口特征为准解理断裂;而熔体温度为1 200 ℃时,定向凝固线材马氏体的母相择优生长面为(011)、 和 ,马氏体形貌全部呈平行片状,线材的伸长率达到16.9%,断口特征为韧性断裂。枝状马氏体在拉伸变形时阻碍位错滑移,抑制马氏体相变的发生;而平行片状马氏体拉伸变形时,有利于不全位错的运动,促进马氏体相变的发生,产生相变塑性,因而具有更强的塑性变形能力。

 

关键字: Cu-12%Al合金;连续定向凝固;马氏体;相变塑性

Martensite structure of Cu-12%Al alloy and
 its effect on mechanical properties
LIU Jin-ping1, 2, LIU Xue-feng1, 2, HUANG Hai-you1, 2, XIE Jian-xin1, 2

1. Key Laboratory for Advanced Materials Processing, Ministry of Education,
 University of Science and Technology Beijing, Beijing 100083, China;
2. Institute for Advanced Materials and Technology,
University of Science and Technology Beijing, Beijing 100083, China

Abstract:Cu-12%Al (mass fraction) alloy single crystal wires were prepared by the continuous unidirectional solidification. Various martensite structures were obtained by changing the melt temperature. The effects of martensite orientation and morphologies on the mechanical properties of the alloy wires were investigated. The results show that the Cu-12%Al alloy wires with a diameter of 6 mm have single crystal structure fabricated at drawing velocity of 10 mm/min, cooling water temperature of 20 ℃, water flow rate of 400 L/h, and melt temperature of 1 150 or 1 200 ℃. The preferred growth planes of martensite parent phases are (100) and   for the alloy wires fabricated at melt temperature of   1 150 ℃ and martensite morphologies are of the mixture of the forked and lamellar, and their elongations and fracture feature are 5.1% and quasi-cleavage fracture, respectively. The preferred growth planes of martensite parent phases are (011),  and  for the alloy wires at melt temperature of 1 200 ℃ and the martensite morphology is lamellar, and their elongations and fracture feature are 16.9% and ductile fracture, respectively. The forked martensite structure can obstruct the dislocation slip and inhibit the occurrence of the martensite transformation. The parallel martensite structure exhibits better plastic deformation capacity induced by martensite transformation because it benefits the movement of the partial dislocation, which results in the occurrence of martensite transformation.

 

Key words: Cu-12%Al alloy; continuous unidirectional solidification; martensite; phase transformation plasticity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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