2Ca(Al,Mg)20金屬間化合物相。當(dāng)Ca大于等于0.28%時(shí),塊狀(Ti,Cr)2Ca(Al,Mg)20相和不連續(xù)條狀A(yù)l2Ca相共同在晶界富集。隨Ca含量的增加,合金中塊狀相和條狀相尺寸逐漸增大,數(shù)量逐漸增加。合金抗拉強(qiáng)度隨Ca元素的增加先升高再降低,Ca含量0.28%時(shí)抗拉強(qiáng)度達(dá)到峰值。Ca小于0.28%時(shí),合金塑性和沖擊韌性緩慢下降,當(dāng)Ca大于0.28%時(shí),條狀A(yù)l2Ca相和塊狀(Ti,Cr)2Ca(Al,Mg)20相在晶界共存,低應(yīng)力下兩相破裂成為裂紋源,Al2Ca硬脆相削弱了晶間結(jié)合強(qiáng)度,合金塑韌性大幅下降。合金拉伸或沖擊斷口由穿晶延性斷裂(Ca<0.28%)轉(zhuǎn)變?yōu)榇嘈詳嗔?Ca>0.28%)。Ca含量0.28%為合金韌脆轉(zhuǎn)變點(diǎn)。"/>

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雜質(zhì)Ca對(duì)Al-5Mg填充合金凝固組織及力學(xué)性能的影響
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1. 鄭州機(jī)械研究所 新型釬焊材料與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,1. 鄭州機(jī)械研究所 新型釬焊材料與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,1. 鄭州機(jī)械研究所 新型釬焊材料與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,1. 鄭州機(jī)械研究所 新型釬焊材料與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,1. 鄭州機(jī)械研究所 新型釬焊材料與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室

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TG422

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國(guó)家國(guó)際科技合作計(jì)劃項(xiàng)目 (2015DFA50470); 華南理工大學(xué)國(guó)家金屬材料近凈成形工程技術(shù)研究中心開(kāi)放基金項(xiàng)目(2013001).


Effect of Ca impurity on microstructures and mechanical properties of as-cast Al-5Mg filler metalsT
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State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering,State Key Laboratory of Advanced Brazing Filler Metals Technology,Zhengzhou Research Institute of Mechanical Engineering

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    結(jié)合拉伸試驗(yàn)和沖擊試驗(yàn),采用SEM、EDS和XRD等分析方法研究了雜質(zhì)元素Ca對(duì)鋁鎂焊接填充合金鑄態(tài)凝固組織和力學(xué)性能的影響。結(jié)果表明,Ca元素的存在改變了合金相組成。當(dāng)Ca小于0.28%,合金中晶界富集由塊狀(Ti,Cr)2Ca(Al,Mg)20金屬間化合物相。當(dāng)Ca大于等于0.28%時(shí),塊狀(Ti,Cr)2Ca(Al,Mg)20相和不連續(xù)條狀A(yù)l2Ca相共同在晶界富集。隨Ca含量的增加,合金中塊狀相和條狀相尺寸逐漸增大,數(shù)量逐漸增加。合金抗拉強(qiáng)度隨Ca元素的增加先升高再降低,Ca含量0.28%時(shí)抗拉強(qiáng)度達(dá)到峰值。Ca小于0.28%時(shí),合金塑性和沖擊韌性緩慢下降,當(dāng)Ca大于0.28%時(shí),條狀A(yù)l2Ca相和塊狀(Ti,Cr)2Ca(Al,Mg)20相在晶界共存,低應(yīng)力下兩相破裂成為裂紋源,Al2Ca硬脆相削弱了晶間結(jié)合強(qiáng)度,合金塑韌性大幅下降。合金拉伸或沖擊斷口由穿晶延性斷裂(Ca<0.28%)轉(zhuǎn)變?yōu)榇嘈詳嗔?Ca>0.28%)。Ca含量0.28%為合金韌脆轉(zhuǎn)變點(diǎn)。

    Abstract:

    Effects of Ca impurity on microstructures and mechanical properties of Al-5Mg filler metals were investigated with SEM, EDS, XRD, tensile test and impact test. The results indicate that the phase composition of Al-5Mg alloy is changed by the Ca impurity. It is observed that block-like (Ti,Cr)2Ca(Al,Mg)20 phase distributed discontinuously along the grain boundaries when the Ca content is less than 0.28%. When the content of Ca is over 0.28%, bar-like Al2Ca and block-like (Ti,Cr)2Ca(Al,Mg)20 combine together and distribute along the grain boundaries, and the amount and size of Ca-rich phase (both the bar-like and block-like) increase with the Ca content. Tensile strength of the Al-5Mg alloys increases firstly and then decreases with increasing Ca content, and the tensile strength gets to maximum value when the content of Ca is 0.28 wt%. The plasticity and fracture toughness decrease smoothly (Ca 0-0.28%) but then significantly (Ca>0.28%), and the tensile or impact fracture mode transform from the transgranular ductile fracture to the brittle cleavage fracture.

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路全彬,沈元?jiǎng)?鐘素娟,趙辰豐,龍偉民.雜質(zhì)Ca對(duì)Al-5Mg填充合金凝固組織及力學(xué)性能的影響[J].稀有金屬材料與工程,2018,47(6):1739~1743.[Lu Quanbin, Shen Yuanxun, Zhong Sujuan, Zhao Chenfeng, Long Weimin. Effect of Ca impurity on microstructures and mechanical properties of as-cast Al-5Mg filler metalsT[J]. Rare Metal Materials and Engineering,2018,47(6):1739~1743.]
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  • 收稿日期:2016-06-02
  • 最后修改日期:2016-07-29
  • 錄用日期:2016-08-18
  • 在線發(fā)布日期: 2018-09-06
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