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金属学报  2017, Vol. 53 Issue (2): 211-219    DOI: 10.11900/0412.1961.2016.00353
  本期目录 | 过刊浏览 |
Mg-5Al-xCa合金的热裂行为
王峰(),董海阔,王志,毛萍莉,刘正
沈阳工业大学材料科学与工程学院 沈阳 110870
Hot Cracking Behavior of Mg-5Al-xCa Alloys
Feng WANG(),Haikuo DONG,Zhi WANG,Pingli MAO,Zheng LIU
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
全文: PDF(6574 KB)   HTML
摘要: 

在浇注温度700 ℃、模具温度200 ℃条件下,通过热裂曲线和凝固曲线测试以及OM、XRD、SEM等手段分析了Ca加入量对Mg-5Al-xCa (x=0.5、1.0、2.0、3.0、4.0、5.0,质量分数,%)合金热裂敏感性的影响。结果表明,当Ca加入量增加到4.0%时,合金的热裂敏感性随着Ca加入量的增加而减小;Mg-5Al-4.0Ca合金的热裂敏感性最小,其热裂敏感性系数仅为0.824;Ca加入量增加到5.0%时,合金的热裂敏感性又出现上升,其热裂敏感性系数上升到0.96。加入适量的Ca会降低Mg-5Al-xCa合金凝固时α-Mg的析出温度,并抑制Mg17Al12相形成,缩小合金凝固温度范围,增加组织中的共晶含量,有利于合金凝固后期的补缩,从而降低合金的热裂敏感性。但加入过多的Ca会增加含Ca脆性相的数量,并使合金组织发生粗化,从而导致合金的热裂敏感性增加。

关键词 Mg-Al-Ca合金热裂敏感性凝固曲线显微组织    
Abstract

Mg-Al-Ca base alloys have great potential for application because of its low cost and good high temperature creep properties, but its higher hot cracking susceptibility greatly limits the application of the alloy. The effect of Ca addition on the hot cracking susceptibility of Mg-5Al-xCa (x=0.5, 1.0, 2.0, 3.0, 4.0, 5.0, mass fraction, %) alloys at the pouring temperature 700 ℃ and mold temperature 200 ℃ was studied by using hot cracking curve test, solidification curve test, OM, XRD and SEM. The results showed that the hot cracking susceptibility of alloys decreased with increasing Ca addition until to 4.0%, and the Mg-5Al-4.0Ca alloy had minimal hot cracking susceptibility, which cracking susceptibility coefficient was only 0.824. But when Ca addition increased to 5.0%, the hot cracking susceptibility of the alloy increased, and the cracking susceptibility coefficient increased to 0.96. The appropriate Ca addition can reduce the precipitation temperature of α-Mg in Mg-5Al-xCa alloys, inhibit precipitation of Mg17Al12 phase, narrow solidification temperature range of the alloy and increase eutectic content, which are helpful for the alloy having a stronger ability of compensation at the solidification end to decrease hot cracking susceptibility. But excessive Ca addition will increase the numbers of brittle phases containing Ca and coarsen the microstructure, resulting in the increase of hot cracking susceptibility.

Key wordsMg-Al-Ca alloy    hot cracking susceptibility    solidification curve    microstructure
收稿日期: 2016-08-02      出版日期: 2016-12-08
基金资助:国家自然科学基金项目Nos.51504153和51571145以及辽宁省自然科学基金项目No.201602548

引用本文:

王峰,董海阔,王志,毛萍莉,刘正. Mg-5Al-xCa合金的热裂行为[J]. 金属学报, 2017, 53(2): 211-219.
Feng WANG,Haikuo DONG,Zhi WANG,Pingli MAO,Zheng LIU. Hot Cracking Behavior of Mg-5Al-xCa Alloys. Acta Metall Sin, 2017, 53(2): 211-219.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00353      或      http://www.ams.org.cn/CN/Y2017/V53/I2/211

Alloy Al Ca Mg
Mg-5Al-0.5Ca 4.65 0.42 Bal.
Mg-5Al-1.0Ca 4.80 0.83 Bal.
Mg-5Al-2.0Ca 4.59 1.67 Bal.
Mg-5Al-3.0Ca 4.81 2.54 Bal.
Mg-5Al-4.0Ca 4.67 3.61 Bal.
Mg-5Al-5.0Ca 4.52 4.51 Bal.
表1  Mg-5Al-xCa合金的化学成分
图1  热裂测试系统示意图及热裂试样
图2  Mg-5Al-xCa合金热裂试样照片
图3  Mg-5Al-xCa合金热裂曲线
Alloy Hot crack initiation Hot crack propagation
θi / ℃ fs-i / % Fr / N tp / s vP / (Ns-1)
Mg-5Al-0.5Ca 467 98.2 0.614 0.72 0.853
Mg-5Al-1.0Ca 451 97.4 0.536 1.26 0.425
Mg-5Al-2.0Ca 430 97.1 0.371 0.91 0.408
Mg-5Al-3.0Ca 434 97.6 0.215 1.17 0.184
Mg-5Al-4.0Ca - - - - -
Mg-5Al-5.0Ca 441 98.5 2.079 2.67 0.779
表2  Mg-5Al-xCa合金热裂测试结果
图4  Mg-5Al-xCa合金凝固曲线
Alloy Peak A Peak B Peak C Peak D Peak E
α-Mg L→α+C14 L→α+C36 L+C36 → α+A12 L→α+C14+C36
Mg-5Al-0.5Ca 621 525 513 424 -
Mg-5Al-1.0Ca 619 525 519 - -
Mg-5Al-2.0Ca 614 528 521 - -
Mg-5Al-3.0Ca 610 - 528 - -
Mg-5Al-4.0Ca 598 - 528 - 511
Mg-5Al-5.0Ca 598 - 528 - 512
表3  图4中Mg-5Al-xCa合金凝固曲线对应关键点反应及反应温度
图5  Mg-5Al-xCa合金凝固温度范围及热裂敏感性系数
图6  Mg-5Al-xCa合金热裂部位的显微组织
图7  Mg-5Al-xCa合金SEM像
图8  Mg-5Al-xCa合金的XRD谱
图9  Mg-5Al-4.0Ca合金裂纹延伸末端及局部SEM像
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