7075由美铝公司在1943年推出，在航空航天工业，7075至今一直是7xxx系列合金的主力力量。这是第一次成功的在AL-Zn-Mg-Cu系高强度合金中使用加入了铬合金，使之形成了良好的抗应力腐蚀开裂的板材产品，其效益影响深刻。虽然其他7xxx合金至今也已开发与改进了特定的属性，7075仍然是一个很好的平衡航空航天应用所需的性能基线。  
Alloy    7075    is    Introduced    by    Alcoa    in    1943,    alloy    7075    has    been    the    standard    workhorse    7XXX    series    alloy    within    the    aerospace    industry    ever    since.    It    was    the    first    successful    Al-Zn-Mg-Cu    high    strength    alloy    using    the    beneficial    effects    of    the    alloying    addition    of    chromium    to    develop    good    stress-corrosion    cracking    resistance    in    sheet    products.    Although    other    7XXX    alloys    have    since    been    developed    with    improved    specific    properties,    alloy    7075    remains    the    baseline    with    a    good    balance    of    properties    required    for    aerospace    applications.  
7075合金薄板和中厚板产品应用遍及航空航天结构当中，其中，适中的韧性和腐蚀性的高强度结合是材料所必须具有的。  
Alloy    7075    sheet    and    plate    products    have    application    throughout    aircraft    and    aerospace    structures    where    a    combination    of    high    strength    with    moderate    toughness    and    corrosion    resistance    are    required.  
化学成分范围（重量%）CHEMICAL    COMPOSITON    LIMIES    (WT.%)  

Si        0.40        Zn    .    .    .        5.1-6.1  
Fe        .    .    .        0.50        Ti    .    .    .        0.20  
Cu    .    .    .        1.2-2.0        Others,    each    .    .    .        0.5  
Mn    .    .    .        0.30        Others,    total    .    .    .        0.15  
Mg    .    .    .        2.1-2.9        Balance,    Aluminum          
Cr        .    .    .        0.18-0.28                  

Note:    Value    maximum    if    range    not    shown  
机械性能（MECHAN    NICAL    PROPERTIES）  

Temper        Thickness    in.(mm)        TENSILESTRENGTH  
Ksi（Mpa）        YIEID    STRENGTH  
Ksi（Mpa）        ELONGATION  
%  
0        0.015-2.00        40    (max)        21    (max)        9-10  
Sheet    &    plate    T6        (0.38-50.80)    0.008-0.249        (276)  
74-78        (145)  
63-69          
5-8  
Sheet        T651        (0.203-6.32)    0.250-4.000        (510-538)  
78-67        (434-476)  
67-54          
9-3  
Plate                T76        (6.35-101.60)    0.125-0.249        (538-462)  
73        (462-372)  
62          
8  
Sheet        T7651        (3.18-6.32)    0.250-1.000        (503)  
72-71        (427)  
61-60          
8-6  
Plate                T73        (6.35-25.40)    0.040-0.249        (496-490)  
67        (421-414)  
56          
8  
Sheet        T7351        (1.02-6.32)    0.250-4.000        (462)  
69-61        (386)  
57-48          
7-6  
Plate        (6.35-101.60)        (476-421)        (393-331)          
7075所有的值都是最低的横向机械性能除非另有说明（ALLOY    7075    All    values    are    minimum    long    transverse    mechanical    properties    except    where    noted）  
合金7075典型的断裂韧性值（TYPICAL    FRACTURE    TOUGHNESS    VALUES    Alloy    7075    Plate）  


7075        T651  
T7351        26    (28.6)  
30    (32.0)        22(24.2)  
26    (28.6)  

PROCUREMENT            SPECIFICATIONS  
PLATE  
Temper                                                                                                    T651                                                                                                                                    T7651  
Specification                                                                        QQ-A-250/13                                                                                QQ-A-250/24  
MIL-HDBK-5                                                                    Approved  
BARE    SHEET                                                                                                                                                                                                                                    ALCLAD    SHEET  

Specification                                                                        QQ-A-250/12,24                                                            QQ-A-250/13,25,26  
MIL-HDBK-5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Approved                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Approved  

其他产品形式（OTHERPRODUCT    FORMS）  
7XXX  
此合金是一种可进行阳极氧